Hello,
syzbot hit the following crash on upstream commit
79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (Mon Feb 19 19:58:19 2018 +0000)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
So far this crash happened 2 times on
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
audit: type=1400 audit(1519151768.973:11): avc: denied { sys_chroot }
for pid=4169 comm="syz-executor5" capability=18
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
permissive=1
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 5074 at lib/refcount.c:187
refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 5074 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #322
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x211/0x2d0 lib/bug.c:184
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
RIP: 0010:refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
RSP: 0018:ffff8801cf2b6490 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: 0000000000000401 RCX: ffffffff815abdbe
RDX: 0000000000000000 RSI: 1ffff10039e56c42 RDI: 1ffff10039e56c17
RBP: ffff8801cf2b6520 R08: 1ffff10039e56bd9 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e56c93
R13: 00000000ffffff01 R14: 0000000000000500 R15: ffff8801ae3c69fc
sock_wfree+0xa6/0x140 net/core/sock.c:1819
sctp_wfree+0x2eb/0x670 net/sctp/socket.c:8065
skb_release_head_state+0x124/0x260 net/core/skbuff.c:612
skb_release_all+0x15/0x60 net/core/skbuff.c:625
__kfree_skb net/core/skbuff.c:641 [inline]
consume_skb+0x153/0x490 net/core/skbuff.c:701
sctp_chunk_destroy net/sctp/sm_make_chunk.c:1450 [inline]
sctp_chunk_put+0x29c/0x420 net/sctp/sm_make_chunk.c:1477
sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1464
__sctp_outq_teardown+0x244/0x1230 net/sctp/outqueue.c:234
sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
sctp_association_free+0x2d0/0x930 net/sctp/associola.c:356
sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1343 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
sctp_do_sm+0x32e3/0x6ed0 net/sctp/sm_sideeffect.c:1181
sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
sctp_close+0x266/0x9a0 net/sctp/socket.c:1539
inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
sock_release+0x8d/0x1e0 net/socket.c:595
sock_close+0x16/0x20 net/socket.c:1149
__fput+0x327/0x7e0 fs/file_table.c:209
____fput+0x15/0x20 fs/file_table.c:243
task_work_run+0x199/0x270 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9bb/0x1ad0 kernel/exit.c:865
do_group_exit+0x149/0x400 kernel/exit.c:968
get_signal+0x73a/0x16d0 kernel/signal.c:2469
do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453da9
RSP: 002b:00007f297546ace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000453da9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a3e8ef R14: 00007f297546b9c0 R15: 0000000000000001
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to [email protected].
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
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and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
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If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
On Wed, Feb 21, 2018 at 9:59 PM, syzbot
<[email protected]> wrote:
> Hello,
>
> syzbot hit the following crash on upstream commit
> 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (Mon Feb 19 19:58:19 2018 +0000)
> Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
>
> So far this crash happened 2 times on
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master.
> syzkaller reproducer is attached.
> Raw console output is attached.
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> audit: type=1400 audit(1519151768.973:11): avc: denied { sys_chroot } for
> pid=4169 comm="syz-executor5" capability=18
> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
> permissive=1
> ------------[ cut here ]------------
> refcount_t: underflow; use-after-free.
> WARNING: CPU: 0 PID: 5074 at lib/refcount.c:187
> refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> Kernel panic - not syncing: panic_on_warn set ...
It seems that we also need to process the chunks in
outqueue->control_chunk_list in sctp_for_each_tx_datachunk()
when peeling off.
>
> CPU: 0 PID: 5074 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #322
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> __dump_stack lib/dump_stack.c:17 [inline]
> dump_stack+0x194/0x257 lib/dump_stack.c:53
> panic+0x1e4/0x41c kernel/panic.c:183
> __warn+0x1dc/0x200 kernel/panic.c:547
> report_bug+0x211/0x2d0 lib/bug.c:184
> fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
> fixup_bug arch/x86/kernel/traps.c:247 [inline]
> do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
> do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
> invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
> RIP: 0010:refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> RSP: 0018:ffff8801cf2b6490 EFLAGS: 00010282
> RAX: dffffc0000000008 RBX: 0000000000000401 RCX: ffffffff815abdbe
> RDX: 0000000000000000 RSI: 1ffff10039e56c42 RDI: 1ffff10039e56c17
> RBP: ffff8801cf2b6520 R08: 1ffff10039e56bd9 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e56c93
> R13: 00000000ffffff01 R14: 0000000000000500 R15: ffff8801ae3c69fc
> sock_wfree+0xa6/0x140 net/core/sock.c:1819
> sctp_wfree+0x2eb/0x670 net/sctp/socket.c:8065
> skb_release_head_state+0x124/0x260 net/core/skbuff.c:612
> skb_release_all+0x15/0x60 net/core/skbuff.c:625
> __kfree_skb net/core/skbuff.c:641 [inline]
> consume_skb+0x153/0x490 net/core/skbuff.c:701
> sctp_chunk_destroy net/sctp/sm_make_chunk.c:1450 [inline]
> sctp_chunk_put+0x29c/0x420 net/sctp/sm_make_chunk.c:1477
> sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1464
> __sctp_outq_teardown+0x244/0x1230 net/sctp/outqueue.c:234
> sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
> sctp_association_free+0x2d0/0x930 net/sctp/associola.c:356
> sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
> sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1343 [inline]
> sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
> sctp_do_sm+0x32e3/0x6ed0 net/sctp/sm_sideeffect.c:1181
> sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
> sctp_close+0x266/0x9a0 net/sctp/socket.c:1539
> inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
> sock_release+0x8d/0x1e0 net/socket.c:595
> sock_close+0x16/0x20 net/socket.c:1149
> __fput+0x327/0x7e0 fs/file_table.c:209
> ____fput+0x15/0x20 fs/file_table.c:243
> task_work_run+0x199/0x270 kernel/task_work.c:113
> exit_task_work include/linux/task_work.h:22 [inline]
> do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> do_group_exit+0x149/0x400 kernel/exit.c:968
> get_signal+0x73a/0x16d0 kernel/signal.c:2469
> do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
> exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
> prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
> entry_SYSCALL_64_after_hwframe+0x42/0xb7
> RIP: 0033:0x453da9
> RSP: 002b:00007f297546ace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000453da9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
> RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000a3e8ef R14: 00007f297546b9c0 R15: 0000000000000001
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to [email protected].
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
On Thu, Feb 22, 2018 at 10:50 AM Xin Long <[email protected]> wrote:
>
> On Wed, Feb 21, 2018 at 9:59 PM, syzbot
> <[email protected]> wrote:
> > Hello,
> >
> > syzbot hit the following crash on upstream commit
> > 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (Mon Feb 19 19:58:19 2018 +0000)
> > Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
> >
> > So far this crash happened 2 times on
> > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master.
> > syzkaller reproducer is attached.
> > Raw console output is attached.
> > compiler: gcc (GCC) 7.1.1 20170620
> > .config is attached.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> > It will help syzbot understand when the bug is fixed. See footer for
> > details.
> > If you forward the report, please keep this part and the footer.
> >
> > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > audit: type=1400 audit(1519151768.973:11): avc: denied { sys_chroot } for
> > pid=4169 comm="syz-executor5" capability=18
> > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
> > permissive=1
> > ------------[ cut here ]------------
> > refcount_t: underflow; use-after-free.
> > WARNING: CPU: 0 PID: 5074 at lib/refcount.c:187
> > refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > Kernel panic - not syncing: panic_on_warn set ...
> It seems that we also need to process the chunks in
> outqueue->control_chunk_list in sctp_for_each_tx_datachunk()
> when peeling off.
Hi Xin,
Did you mail any fix for this?
The bug is still open, but the crash did not happen in the past
months. It seems that 3 different bugs accumulated in this bug: there
was a splash of crashes in Feb 2018, then it stopped crashing, then
some crashes in May 2018, probably a different bug, then stopped
happening again, then another splash in Nov 2018, most likely a
different bugs, then it stopped happening again. If we keep it open,
it will continue accumulating more different bugs.
> > CPU: 0 PID: 5074 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #322
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Call Trace:
> > __dump_stack lib/dump_stack.c:17 [inline]
> > dump_stack+0x194/0x257 lib/dump_stack.c:53
> > panic+0x1e4/0x41c kernel/panic.c:183
> > __warn+0x1dc/0x200 kernel/panic.c:547
> > report_bug+0x211/0x2d0 lib/bug.c:184
> > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
> > fixup_bug arch/x86/kernel/traps.c:247 [inline]
> > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
> > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
> > invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
> > RIP: 0010:refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > RSP: 0018:ffff8801cf2b6490 EFLAGS: 00010282
> > RAX: dffffc0000000008 RBX: 0000000000000401 RCX: ffffffff815abdbe
> > RDX: 0000000000000000 RSI: 1ffff10039e56c42 RDI: 1ffff10039e56c17
> > RBP: ffff8801cf2b6520 R08: 1ffff10039e56bd9 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e56c93
> > R13: 00000000ffffff01 R14: 0000000000000500 R15: ffff8801ae3c69fc
> > sock_wfree+0xa6/0x140 net/core/sock.c:1819
> > sctp_wfree+0x2eb/0x670 net/sctp/socket.c:8065
> > skb_release_head_state+0x124/0x260 net/core/skbuff.c:612
> > skb_release_all+0x15/0x60 net/core/skbuff.c:625
> > __kfree_skb net/core/skbuff.c:641 [inline]
> > consume_skb+0x153/0x490 net/core/skbuff.c:701
> > sctp_chunk_destroy net/sctp/sm_make_chunk.c:1450 [inline]
> > sctp_chunk_put+0x29c/0x420 net/sctp/sm_make_chunk.c:1477
> > sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1464
> > __sctp_outq_teardown+0x244/0x1230 net/sctp/outqueue.c:234
> > sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
> > sctp_association_free+0x2d0/0x930 net/sctp/associola.c:356
> > sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
> > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1343 [inline]
> > sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
> > sctp_do_sm+0x32e3/0x6ed0 net/sctp/sm_sideeffect.c:1181
> > sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
> > sctp_close+0x266/0x9a0 net/sctp/socket.c:1539
> > inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
> > sock_release+0x8d/0x1e0 net/socket.c:595
> > sock_close+0x16/0x20 net/socket.c:1149
> > __fput+0x327/0x7e0 fs/file_table.c:209
> > ____fput+0x15/0x20 fs/file_table.c:243
> > task_work_run+0x199/0x270 kernel/task_work.c:113
> > exit_task_work include/linux/task_work.h:22 [inline]
> > do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> > do_group_exit+0x149/0x400 kernel/exit.c:968
> > get_signal+0x73a/0x16d0 kernel/signal.c:2469
> > do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
> > exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
> > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> > syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> > do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
> > entry_SYSCALL_64_after_hwframe+0x42/0xb7
> > RIP: 0033:0x453da9
> > RSP: 002b:00007f297546ace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> > RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000453da9
> > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
> > RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> > R13: 0000000000a3e8ef R14: 00007f297546b9c0 R15: 0000000000000001
> > Dumping ftrace buffer:
> > (ftrace buffer empty)
> > Kernel Offset: disabled
> > Rebooting in 86400 seconds..
> >
> >
> > ---
> > This bug is generated by a dumb bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for details.
> > Direct all questions to [email protected].
> >
> > syzbot will keep track of this bug report.
> > If you forgot to add the Reported-by tag, once the fix for this bug is
> > merged
> > into any tree, please reply to this email with:
> > #syz fix: exact-commit-title
> > If you want to test a patch for this bug, please reply with:
> > #syz test: git://repo/address.git branch
> > and provide the patch inline or as an attachment.
> > To mark this as a duplicate of another syzbot report, please reply with:
> > #syz dup: exact-subject-of-another-report
> > If it's a one-off invalid bug report, please reply with:
> > #syz invalid
> > Note: if the crash happens again, it will cause creation of a new bug
> > report.
> > Note: all commands must start from beginning of the line in the email body.
>
> --
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On Tue, Apr 9, 2019 at 4:23 PM Dmitry Vyukov <[email protected]> wrote:
>
> On Thu, Feb 22, 2018 at 10:50 AM Xin Long <[email protected]> wrote:
> >
> > On Wed, Feb 21, 2018 at 9:59 PM, syzbot
> > <[email protected]> wrote:
> > > Hello,
> > >
> > > syzbot hit the following crash on upstream commit
> > > 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (Mon Feb 19 19:58:19 2018 +0000)
> > > Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
> > >
> > > So far this crash happened 2 times on
> > > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master.
> > > syzkaller reproducer is attached.
> > > Raw console output is attached.
> > > compiler: gcc (GCC) 7.1.1 20170620
> > > .config is attached.
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: [email protected]
> > > It will help syzbot understand when the bug is fixed. See footer for
> > > details.
> > > If you forward the report, please keep this part and the footer.
> > >
> > > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > > audit: type=1400 audit(1519151768.973:11): avc: denied { sys_chroot } for
> > > pid=4169 comm="syz-executor5" capability=18
> > > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> > > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
> > > permissive=1
> > > ------------[ cut here ]------------
> > > refcount_t: underflow; use-after-free.
> > > WARNING: CPU: 0 PID: 5074 at lib/refcount.c:187
> > > refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > > Kernel panic - not syncing: panic_on_warn set ...
> > It seems that we also need to process the chunks in
> > outqueue->control_chunk_list in sctp_for_each_tx_datachunk()
> > when peeling off.
>
> Hi Xin,
>
> Did you mail any fix for this?
No, I realized it doesn't make difference to add the process for
control_chunk_list in sctp_for_each_tx_datachunk().
> The bug is still open, but the crash did not happen in the past
> months. It seems that 3 different bugs accumulated in this bug: there
> was a splash of crashes in Feb 2018, then it stopped crashing, then
> some crashes in May 2018, probably a different bug, then stopped
> happening again, then another splash in Nov 2018, most likely a
> different bugs, then it stopped happening again. If we keep it open,
> it will continue accumulating more different bugs.
We've had some fixes for peeling off process added in the latest kernel
since then, which could be related. So I think we can close this one now,
and let's see what the new bugs will look like.
Thanks.
>
>
>
> > > CPU: 0 PID: 5074 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #322
> > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > Google 01/01/2011
> > > Call Trace:
> > > __dump_stack lib/dump_stack.c:17 [inline]
> > > dump_stack+0x194/0x257 lib/dump_stack.c:53
> > > panic+0x1e4/0x41c kernel/panic.c:183
> > > __warn+0x1dc/0x200 kernel/panic.c:547
> > > report_bug+0x211/0x2d0 lib/bug.c:184
> > > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
> > > fixup_bug arch/x86/kernel/traps.c:247 [inline]
> > > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
> > > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
> > > invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
> > > RIP: 0010:refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > > RSP: 0018:ffff8801cf2b6490 EFLAGS: 00010282
> > > RAX: dffffc0000000008 RBX: 0000000000000401 RCX: ffffffff815abdbe
> > > RDX: 0000000000000000 RSI: 1ffff10039e56c42 RDI: 1ffff10039e56c17
> > > RBP: ffff8801cf2b6520 R08: 1ffff10039e56bd9 R09: 0000000000000000
> > > R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e56c93
> > > R13: 00000000ffffff01 R14: 0000000000000500 R15: ffff8801ae3c69fc
> > > sock_wfree+0xa6/0x140 net/core/sock.c:1819
> > > sctp_wfree+0x2eb/0x670 net/sctp/socket.c:8065
> > > skb_release_head_state+0x124/0x260 net/core/skbuff.c:612
> > > skb_release_all+0x15/0x60 net/core/skbuff.c:625
> > > __kfree_skb net/core/skbuff.c:641 [inline]
> > > consume_skb+0x153/0x490 net/core/skbuff.c:701
> > > sctp_chunk_destroy net/sctp/sm_make_chunk.c:1450 [inline]
> > > sctp_chunk_put+0x29c/0x420 net/sctp/sm_make_chunk.c:1477
> > > sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1464
> > > __sctp_outq_teardown+0x244/0x1230 net/sctp/outqueue.c:234
> > > sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
> > > sctp_association_free+0x2d0/0x930 net/sctp/associola.c:356
> > > sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
> > > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1343 [inline]
> > > sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
> > > sctp_do_sm+0x32e3/0x6ed0 net/sctp/sm_sideeffect.c:1181
> > > sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
> > > sctp_close+0x266/0x9a0 net/sctp/socket.c:1539
> > > inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
> > > sock_release+0x8d/0x1e0 net/socket.c:595
> > > sock_close+0x16/0x20 net/socket.c:1149
> > > __fput+0x327/0x7e0 fs/file_table.c:209
> > > ____fput+0x15/0x20 fs/file_table.c:243
> > > task_work_run+0x199/0x270 kernel/task_work.c:113
> > > exit_task_work include/linux/task_work.h:22 [inline]
> > > do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> > > do_group_exit+0x149/0x400 kernel/exit.c:968
> > > get_signal+0x73a/0x16d0 kernel/signal.c:2469
> > > do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
> > > exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
> > > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> > > syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> > > do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
> > > entry_SYSCALL_64_after_hwframe+0x42/0xb7
> > > RIP: 0033:0x453da9
> > > RSP: 002b:00007f297546ace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> > > RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000453da9
> > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
> > > RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
> > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> > > R13: 0000000000a3e8ef R14: 00007f297546b9c0 R15: 0000000000000001
> > > Dumping ftrace buffer:
> > > (ftrace buffer empty)
> > > Kernel Offset: disabled
> > > Rebooting in 86400 seconds..
> > >
> > >
> > > ---
> > > This bug is generated by a dumb bot. It may contain errors.
> > > See https://goo.gl/tpsmEJ for details.
> > > Direct all questions to [email protected].
> > >
> > > syzbot will keep track of this bug report.
> > > If you forgot to add the Reported-by tag, once the fix for this bug is
> > > merged
> > > into any tree, please reply to this email with:
> > > #syz fix: exact-commit-title
> > > If you want to test a patch for this bug, please reply with:
> > > #syz test: git://repo/address.git branch
> > > and provide the patch inline or as an attachment.
> > > To mark this as a duplicate of another syzbot report, please reply with:
> > > #syz dup: exact-subject-of-another-report
> > > If it's a one-off invalid bug report, please reply with:
> > > #syz invalid
> > > Note: if the crash happens again, it will cause creation of a new bug
> > > report.
> > > Note: all commands must start from beginning of the line in the email body.
> >
> > --
> > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> > To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
> > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/CADvbK_eandMH1aZvKnzdX%3D3xdS0NSo6_NAeCrKasqA9EON4B0A%40mail.gmail.com.
> > For more options, visit https://groups.google.com/d/optout.
On Tue, Apr 9, 2019 at 12:32 PM Xin Long <[email protected]> wrote:
>
> On Tue, Apr 9, 2019 at 4:23 PM Dmitry Vyukov <[email protected]> wrote:
> >
> > On Thu, Feb 22, 2018 at 10:50 AM Xin Long <[email protected]> wrote:
> > >
> > > On Wed, Feb 21, 2018 at 9:59 PM, syzbot
> > > <[email protected]> wrote:
> > > > Hello,
> > > >
> > > > syzbot hit the following crash on upstream commit
> > > > 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (Mon Feb 19 19:58:19 2018 +0000)
> > > > Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
> > > >
> > > > So far this crash happened 2 times on
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master.
> > > > syzkaller reproducer is attached.
> > > > Raw console output is attached.
> > > > compiler: gcc (GCC) 7.1.1 20170620
> > > > .config is attached.
> > > >
> > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > Reported-by: [email protected]
> > > > It will help syzbot understand when the bug is fixed. See footer for
> > > > details.
> > > > If you forward the report, please keep this part and the footer.
> > > >
> > > > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > > > IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> > > > audit: type=1400 audit(1519151768.973:11): avc: denied { sys_chroot } for
> > > > pid=4169 comm="syz-executor5" capability=18
> > > > scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> > > > tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns
> > > > permissive=1
> > > > ------------[ cut here ]------------
> > > > refcount_t: underflow; use-after-free.
> > > > WARNING: CPU: 0 PID: 5074 at lib/refcount.c:187
> > > > refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > > > Kernel panic - not syncing: panic_on_warn set ...
> > > It seems that we also need to process the chunks in
> > > outqueue->control_chunk_list in sctp_for_each_tx_datachunk()
> > > when peeling off.
> >
> > Hi Xin,
> >
> > Did you mail any fix for this?
> No, I realized it doesn't make difference to add the process for
> control_chunk_list in sctp_for_each_tx_datachunk().
>
> > The bug is still open, but the crash did not happen in the past
> > months. It seems that 3 different bugs accumulated in this bug: there
> > was a splash of crashes in Feb 2018, then it stopped crashing, then
> > some crashes in May 2018, probably a different bug, then stopped
> > happening again, then another splash in Nov 2018, most likely a
> > different bugs, then it stopped happening again. If we keep it open,
> > it will continue accumulating more different bugs.
> We've had some fixes for peeling off process added in the latest kernel
> since then, which could be related. So I think we can close this one now,
> and let's see what the new bugs will look like.
>
> Thanks.
#syz invalid
> > > > CPU: 0 PID: 5074 Comm: syz-executor5 Not tainted 4.16.0-rc2+ #322
> > > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > > Google 01/01/2011
> > > > Call Trace:
> > > > __dump_stack lib/dump_stack.c:17 [inline]
> > > > dump_stack+0x194/0x257 lib/dump_stack.c:53
> > > > panic+0x1e4/0x41c kernel/panic.c:183
> > > > __warn+0x1dc/0x200 kernel/panic.c:547
> > > > report_bug+0x211/0x2d0 lib/bug.c:184
> > > > fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
> > > > fixup_bug arch/x86/kernel/traps.c:247 [inline]
> > > > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
> > > > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
> > > > invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
> > > > RIP: 0010:refcount_sub_and_test+0x167/0x1b0 lib/refcount.c:187
> > > > RSP: 0018:ffff8801cf2b6490 EFLAGS: 00010282
> > > > RAX: dffffc0000000008 RBX: 0000000000000401 RCX: ffffffff815abdbe
> > > > RDX: 0000000000000000 RSI: 1ffff10039e56c42 RDI: 1ffff10039e56c17
> > > > RBP: ffff8801cf2b6520 R08: 1ffff10039e56bd9 R09: 0000000000000000
> > > > R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10039e56c93
> > > > R13: 00000000ffffff01 R14: 0000000000000500 R15: ffff8801ae3c69fc
> > > > sock_wfree+0xa6/0x140 net/core/sock.c:1819
> > > > sctp_wfree+0x2eb/0x670 net/sctp/socket.c:8065
> > > > skb_release_head_state+0x124/0x260 net/core/skbuff.c:612
> > > > skb_release_all+0x15/0x60 net/core/skbuff.c:625
> > > > __kfree_skb net/core/skbuff.c:641 [inline]
> > > > consume_skb+0x153/0x490 net/core/skbuff.c:701
> > > > sctp_chunk_destroy net/sctp/sm_make_chunk.c:1450 [inline]
> > > > sctp_chunk_put+0x29c/0x420 net/sctp/sm_make_chunk.c:1477
> > > > sctp_chunk_free+0x53/0x60 net/sctp/sm_make_chunk.c:1464
> > > > __sctp_outq_teardown+0x244/0x1230 net/sctp/outqueue.c:234
> > > > sctp_outq_free+0x15/0x20 net/sctp/outqueue.c:291
> > > > sctp_association_free+0x2d0/0x930 net/sctp/associola.c:356
> > > > sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:939 [inline]
> > > > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1343 [inline]
> > > > sctp_side_effects net/sctp/sm_sideeffect.c:1210 [inline]
> > > > sctp_do_sm+0x32e3/0x6ed0 net/sctp/sm_sideeffect.c:1181
> > > > sctp_primitive_ABORT+0xa0/0xd0 net/sctp/primitive.c:119
> > > > sctp_close+0x266/0x9a0 net/sctp/socket.c:1539
> > > > inet_release+0xed/0x1c0 net/ipv4/af_inet.c:427
> > > > sock_release+0x8d/0x1e0 net/socket.c:595
> > > > sock_close+0x16/0x20 net/socket.c:1149
> > > > __fput+0x327/0x7e0 fs/file_table.c:209
> > > > ____fput+0x15/0x20 fs/file_table.c:243
> > > > task_work_run+0x199/0x270 kernel/task_work.c:113
> > > > exit_task_work include/linux/task_work.h:22 [inline]
> > > > do_exit+0x9bb/0x1ad0 kernel/exit.c:865
> > > > do_group_exit+0x149/0x400 kernel/exit.c:968
> > > > get_signal+0x73a/0x16d0 kernel/signal.c:2469
> > > > do_signal+0x90/0x1e90 arch/x86/kernel/signal.c:809
> > > > exit_to_usermode_loop+0x258/0x2f0 arch/x86/entry/common.c:162
> > > > prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline]
> > > > syscall_return_slowpath arch/x86/entry/common.c:265 [inline]
> > > > do_syscall_64+0x6e5/0x940 arch/x86/entry/common.c:292
> > > > entry_SYSCALL_64_after_hwframe+0x42/0xb7
> > > > RIP: 0033:0x453da9
> > > > RSP: 002b:00007f297546ace8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> > > > RAX: fffffffffffffe00 RBX: 000000000072bf80 RCX: 0000000000453da9
> > > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000072bf80
> > > > RBP: 000000000072bf80 R08: 0000000000000000 R09: 000000000072bf58
> > > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> > > > R13: 0000000000a3e8ef R14: 00007f297546b9c0 R15: 0000000000000001
> > > > Dumping ftrace buffer:
> > > > (ftrace buffer empty)
> > > > Kernel Offset: disabled
> > > > Rebooting in 86400 seconds..
> > > >
> > > >
> > > > ---
> > > > This bug is generated by a dumb bot. It may contain errors.
> > > > See https://goo.gl/tpsmEJ for details.
> > > > Direct all questions to [email protected].
> > > >
> > > > syzbot will keep track of this bug report.
> > > > If you forgot to add the Reported-by tag, once the fix for this bug is
> > > > merged
> > > > into any tree, please reply to this email with:
> > > > #syz fix: exact-commit-title
> > > > If you want to test a patch for this bug, please reply with:
> > > > #syz test: git://repo/address.git branch
> > > > and provide the patch inline or as an attachment.
> > > > To mark this as a duplicate of another syzbot report, please reply with:
> > > > #syz dup: exact-subject-of-another-report
> > > > If it's a one-off invalid bug report, please reply with:
> > > > #syz invalid
> > > > Note: if the crash happens again, it will cause creation of a new bug
> > > > report.
> > > > Note: all commands must start from beginning of the line in the email body.
> > >
> > > --
> > > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> > > To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
> > > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/CADvbK_eandMH1aZvKnzdX%3D3xdS0NSo6_NAeCrKasqA9EON4B0A%40mail.gmail.com.
> > > For more options, visit https://groups.google.com/d/optout.