LinuxLists.cc - [syzbot] [ext4?] kernel BUG in ext4_write_inline

2023-03-17 03:19:24

Subject: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

Hello,

syzbot found the following issue on:

HEAD commit: 134231664868 Merge tag 'staging-6.3-rc2' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ec9f7ac80000
kernel config: https://syzkaller.appspot.com/x/.config?x=8aef547e348b1ab8
dashboard link: https://syzkaller.appspot.com/bug?extid=f4582777a19ec422b517
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:225!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 2 PID: 24186 Comm: syz-executor.2 Not tainted 6.3.0-rc1-syzkaller-00274-g134231664868 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:ext4_write_inline_data+0x344/0x3e0 fs/ext4/inline.c:225
Code: 5f e9 b0 16 5b ff e8 ab 16 5b ff 45 8d 64 2c c4 41 bd 3c 00 00 00 41 29 ed e9 e8 fe ff ff e8 93 16 5b ff 0f 0b e8 8c 16 5b ff <0f> 0b e8 a5 5c ac ff e9 fe fd ff ff 4c 89 ff e8 98 5c ac ff e9 99
RSP: 0018:ffffc900035673c0 EFLAGS: 00010216
RAX: 000000000001158c RBX: ffff88801cbb02b0 RCX: ffffc900031ea000
RDX: 0000000000040000 RSI: ffffffff8228bf04 RDI: 0000000000000006
RBP: 0000000000000048 R08: 0000000000000006 R09: 0000000000000051
R10: 0000000000000048 R11: 0000000000000000 R12: 0000000000000009
R13: 0000000000000051 R14: ffffc90003567460 R15: ffff88801cbb0872
FS: 0000000000000000(0000) GS:ffff88802cb00000(0063) knlGS:00000000f7f53b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020030018 CR3: 00000000487e6000 CR4: 0000000000150ee0
Call Trace:
<TASK>
ext4_write_inline_data_end+0x2a3/0x12f0 fs/ext4/inline.c:766
ext4_da_write_end+0x396/0x9c0 fs/ext4/inode.c:3149
generic_perform_write+0x316/0x570 mm/filemap.c:3937
ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289
ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710
call_write_iter include/linux/fs.h:1851 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
do_iter_write+0x182/0x700 fs/read_write.c:861
vfs_iter_write+0x74/0xa0 fs/read_write.c:902
iter_file_splice_write+0x743/0xc80 fs/splice.c:778
do_splice_from fs/splice.c:856 [inline]
direct_splice_actor+0x114/0x180 fs/splice.c:1022
splice_direct_to_actor+0x335/0x8a0 fs/splice.c:977
do_splice_direct+0x1ab/0x280 fs/splice.c:1065
do_sendfile+0xb19/0x12c0 fs/read_write.c:1255
__do_compat_sys_sendfile fs/read_write.c:1344 [inline]
__se_compat_sys_sendfile fs/read_write.c:1327 [inline]
__ia32_compat_sys_sendfile+0x1e1/0x220 fs/read_write.c:1327
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7f58579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7f535cc EFLAGS: 00000296 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000000005
RDX: 0000000000000000 RSI: 0000000080000041 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data+0x344/0x3e0 fs/ext4/inline.c:225
Code: 5f e9 b0 16 5b ff e8 ab 16 5b ff 45 8d 64 2c c4 41 bd 3c 00 00 00 41 29 ed e9 e8 fe ff ff e8 93 16 5b ff 0f 0b e8 8c 16 5b ff <0f> 0b e8 a5 5c ac ff e9 fe fd ff ff 4c 89 ff e8 98 5c ac ff e9 99
RSP: 0018:ffffc900035673c0 EFLAGS: 00010216
RAX: 000000000001158c RBX: ffff88801cbb02b0 RCX: ffffc900031ea000
RDX: 0000000000040000 RSI: ffffffff8228bf04 RDI: 0000000000000006
RBP: 0000000000000048 R08: 0000000000000006 R09: 0000000000000051
R10: 0000000000000048 R11: 0000000000000000 R12: 0000000000000009
R13: 0000000000000051 R14: ffffc90003567460 R15: ffff88801cbb0872
FS: 0000000000000000(0000) GS:ffff88802cb00000(0063) knlGS:00000000f7f53b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020030018 CR3: 00000000487e6000 CR4: 0000000000150ee0
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 retq
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi

---
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syzbot engineers can be reached at [email protected].

syzbot will keep track of this issue. See:
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2023-09-06 09:48:41

by syzbot

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Subject: Re: [syzbot] kernel BUG in ext4_write_inline_data

This bug is marked as fixed by commit:
ext4: fix race condition between buffer write and page_mkwrite

But I can't find it in the tested trees[1] for more than 90 days.
Is it a correct commit? Please update it by replying:

#syz fix: exact-commit-title

Until then the bug is still considered open and new crashes with
the same signature are ignored.

Kernel: Linux
Dashboard link: https://syzkaller.appspot.com/bug?extid=f4582777a19ec422b517

---
[1] I expect the commit to be present in:

1. for-kernelci branch of
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git

2. master branch of
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git

3. master branch of
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git

4. main branch of
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git

The full list of 9 trees can be found at
https://syzkaller.appspot.com/upstream/repos

2023-11-01 08:49:52

by syzbot

[permalink] [raw]

Subject: Re: [syzbot] kernel BUG in ext4_write_inline_data

2023-12-13 11:12:16

by syzbot

[permalink] [raw]

Subject: Re: [syzbot] [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

For archival purposes, forwarding an incoming command email to
[email protected].

***

Subject: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data
Author: [email protected]

please test kernel BUG in ext4_write_inline_data

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 44c026a73be8

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 9a84a5f9fef4..2ab1ca192167 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -169,6 +169,7 @@ int ext4_find_inline_data_nolock(struct inode *inode)
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
+ printk("iis: %d, %s\n", EXT4_I(inode)->i_inline_size, __func__);
}
out:
brelse(is.iloc.bh);
@@ -232,7 +233,9 @@ static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
return;

BUG_ON(!EXT4_I(inode)->i_inline_off);
- BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
+ printk("pos: %d, len: %d, iis: %d, %s\n", pos, len, EXT4_I(inode)->i_inline_size, __func__);
+ if (EXT4_I(inode)->i_inline_size > 0)
+ BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);

raw_inode = ext4_raw_inode(iloc);
buffer += pos;
@@ -314,6 +317,7 @@ static int ext4_create_inline_data(handle_t *handle,
EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
+ printk("len: %d, iis: %d, %s\n", len, EXT4_I(inode)->i_inline_size, __func__);
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
get_bh(is.iloc.bh);
@@ -381,6 +385,7 @@ static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
+ printk("iis: %d, %s\n", EXT4_I(inode)->i_inline_size, __func__);
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
get_bh(is.iloc.bh);
error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
@@ -469,6 +474,7 @@ static int ext4_destroy_inline_data_nolock(handle_t *handle,

EXT4_I(inode)->i_inline_off = 0;
EXT4_I(inode)->i_inline_size = 0;
+ printk("iis: %d, %s\n", EXT4_I(inode)->i_inline_size, __func__);
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
out:
brelse(is.iloc.bh);
@@ -1979,6 +1985,7 @@ int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
EXT4_I(inode)->i_inline_size = i_size <
EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE : i_size;
+ printk("isize: %d, iis: %d, %s\n", i_size, EXT4_I(inode)->i_inline_size, __func__);
}

out_error:

2023-12-13 11:56:28

by syzbot

[permalink] [raw]

Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ext4_do_writepages

------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2587!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10 Comm: kworker/u4:0 Not tainted 6.4.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:ext4_do_writepages+0x27a1/0x34a0 fs/ext4/inode.c:2587
Code: fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 bc ed ff ff 48 8b 7c 24 08 e8 49 aa a8 ff e9 ad ed ff ff e8 ef 2f 55 ff <0f> 0b e8 e8 2f 55 ff 48 8b 84 24 b0 00 00 00 48 8d 78 40 48 b8 00
RSP: 0018:ffffc900000f73e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807592bc50 RCX: 0000000000000000
RDX: ffff888016a41dc0 RSI: ffffffff82306c61 RDI: 0000000000000007
RBP: ffffc900000f75f0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88802aede678 R14: ffff88807592beb0 R15: 7fffffffffffffff
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561e569a2950 CR3: 000000002a00e000 CR4: 0000000000350ef0
Call Trace:
<TASK>
ext4_writepages+0x30b/0x780 fs/ext4/inode.c:2792
do_writepages+0x1b4/0x690 mm/page-writeback.c:2551
__writeback_single_inode+0x158/0xe70 fs/fs-writeback.c:1603
writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
wb_writeback+0x2ca/0xa90 fs/fs-writeback.c:2068
wb_do_writeback fs/fs-writeback.c:2211 [inline]
wb_workfn+0x29c/0xfd0 fs/fs-writeback.c:2251
process_one_work+0x9f9/0x15f0 kernel/workqueue.c:2405
worker_thread+0x687/0x1110 kernel/workqueue.c:2552
kthread+0x33a/0x430 kernel/kthread.c:379
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x27a1/0x34a0 fs/ext4/inode.c:2587
Code: fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 bc ed ff ff 48 8b 7c 24 08 e8 49 aa a8 ff e9 ad ed ff ff e8 ef 2f 55 ff <0f> 0b e8 e8 2f 55 ff 48 8b 84 24 b0 00 00 00 48 8d 78 40 48 b8 00
RSP: 0018:ffffc900000f73e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807592bc50 RCX: 0000000000000000
RDX: ffff888016a41dc0 RSI: ffffffff82306c61 RDI: 0000000000000007
RBP: ffffc900000f75f0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffff88802aede678 R14: ffff88807592beb0 R15: 7fffffffffffffff
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f629e29e378 CR3: 000000000c772000 CR4: 0000000000350ef0

Tested on:

commit: 44c026a7 Linux 6.4-rc3
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12c7b6fae80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e2045748b9f1055b
dashboard link: https://syzkaller.appspot.com/bug?extid=f4582777a19ec422b517
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=133a9fbce80000

2023-12-15 03:26:12

by syzbot

[permalink] [raw]

Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

For archival purposes, forwarding an incoming command email to
[email protected].

***

Subject: [ext4?] kernel BUG in ext4_write_inline_data
Author: [email protected]

please test kernel BUG in ext4_write_inline_data

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 44c026a73be8

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 9a84a5f9fef4..e0d261ffe623 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -169,6 +169,7 @@ int ext4_find_inline_data_nolock(struct inode *inode)
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
+ printk("iis: %d, in: %p, %s\n", EXT4_I(inode)->i_inline_size, inode, __func__);
}
out:
brelse(is.iloc.bh);
@@ -232,7 +233,9 @@ static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
return;

BUG_ON(!EXT4_I(inode)->i_inline_off);
- BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
+ printk("pos: %d, len: %d, in: %p, iis: %d, %s\n", pos, len, inode, EXT4_I(inode)->i_inline_size, __func__);
+ if (EXT4_I(inode)->i_inline_size > 0)
+ BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);

raw_inode = ext4_raw_inode(iloc);
buffer += pos;
@@ -314,6 +317,7 @@ static int ext4_create_inline_data(handle_t *handle,
EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
+ printk("len: %d, in: %p, iis: %d, %s\n", len, inode, EXT4_I(inode)->i_inline_size, __func__);
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
get_bh(is.iloc.bh);
@@ -381,6 +385,7 @@ static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
(void *)ext4_raw_inode(&is.iloc));
EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
le32_to_cpu(is.s.here->e_value_size);
+ printk("iis: %d, in:%p, %s\n", EXT4_I(inode)->i_inline_size, inode, __func__);
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
get_bh(is.iloc.bh);
error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
@@ -469,6 +474,7 @@ static int ext4_destroy_inline_data_nolock(handle_t *handle,

EXT4_I(inode)->i_inline_off = 0;
EXT4_I(inode)->i_inline_size = 0;
+ printk("iis: %d, in: %p, %s\n", EXT4_I(inode)->i_inline_size, inode, __func__);
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
out:
brelse(is.iloc.bh);
@@ -1979,6 +1985,7 @@ int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
EXT4_I(inode)->i_inline_size = i_size <
EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE : i_size;
+ printk("isize: %d, in: %p, iis: %d, %s\n", i_size, inode, EXT4_I(inode)->i_inline_size, __func__);
}

out_error:

2023-12-15 03:40:17

by syzbot

[permalink] [raw]

Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ext4_do_writepages

------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2587!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10 Comm: kworker/u4:0 Not tainted 6.4.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:ext4_do_writepages+0x27a1/0x34a0 fs/ext4/inode.c:2587
Code: fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 bc ed ff ff 48 8b 7c 24 08 e8 19 aa a8 ff e9 ad ed ff ff e8 bf 2f 55 ff <0f> 0b e8 b8 2f 55 ff 48 8b 84 24 b0 00 00 00 48 8d 78 40 48 b8 00
RSP: 0018:ffffc900000f73e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880684f6e50 RCX: 0000000000000000
RDX: ffff888016649dc0 RSI: ffffffff82306c91 RDI: 0000000000000007
RBP: ffffc900000f75f0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88807e006678 R14: ffff8880684f70b0 R15: 7fffffffffffffff
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07671c7650 CR3: 000000002a381000 CR4: 0000000000350ee0
Call Trace:
<TASK>
ext4_writepages+0x30b/0x780 fs/ext4/inode.c:2792
do_writepages+0x1b4/0x690 mm/page-writeback.c:2551
__writeback_single_inode+0x158/0xe70 fs/fs-writeback.c:1603
writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
wb_writeback+0x2ca/0xa90 fs/fs-writeback.c:2068
wb_do_writeback fs/fs-writeback.c:2211 [inline]
wb_workfn+0x29c/0xfd0 fs/fs-writeback.c:2251
process_one_work+0x9f9/0x15f0 kernel/workqueue.c:2405
worker_thread+0x687/0x1110 kernel/workqueue.c:2552
kthread+0x33a/0x430 kernel/kthread.c:379
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x27a1/0x34a0 fs/ext4/inode.c:2587
Code: fc ff df 44 89 64 24 18 48 c1 ea 03 80 3c 02 00 0f 84 bc ed ff ff 48 8b 7c 24 08 e8 19 aa a8 ff e9 ad ed ff ff e8 bf 2f 55 ff <0f> 0b e8 b8 2f 55 ff 48 8b 84 24 b0 00 00 00 48 8d 78 40 48 b8 00
RSP: 0018:ffffc900000f73e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880684f6e50 RCX: 0000000000000000
RDX: ffff888016649dc0 RSI: ffffffff82306c91 RDI: 0000000000000007
RBP: ffffc900000f75f0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88807e006678 R14: ffff8880684f70b0 R15: 7fffffffffffffff
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f07671c7650 CR3: 0000000029b19000 CR4: 0000000000350ee0

Tested on:

commit: 44c026a7 Linux 6.4-rc3
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=135a5e3ee80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e2045748b9f1055b
dashboard link: https://syzkaller.appspot.com/bug?extid=f4582777a19ec422b517
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=100bda1ee80000

2024-04-05 03:43:29

by syzbot

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