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syzkaller Message-ID: <0000000000006ad6030574fead2e@google.com> Subject: possible deadlock in mon_bin_vma_fault From: syzbot To: arnd@arndb.de, gregkh@linuxfoundation.org, jrdr.linux@gmail.com, keescook@chromium.org, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, viro@zeniv.linux.org.uk, zaitcev@redhat.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 58c3f14f86c9 Merge tag 'riscv-for-linus-4.19-rc2' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12fc6f0e400000 kernel config: https://syzkaller.appspot.com/x/.config?x=531a917630d2a492 dashboard link: https://syzkaller.appspot.com/bug?extid=56f9673bb4cdcbeb0e92 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13dca13e400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17cbe492400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+56f9673bb4cdcbeb0e92@syzkaller.appspotmail.com vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc1+ #215 Not tainted vhci_hcd: default hub control req: 0000 v0000 i0000 l0 ------------------------------------------------------ vhci_hcd: default hub control req: 0000 v0000 i0000 l0 syz-executor605/4648 is trying to acquire lock: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 00000000a9171a30 (&rp->fetch_lock){+.+.}, at: mon_bin_vma_fault+0xdc/0x4a0 drivers/usb/mon/mon_bin.c:1237 but task is already holding lock: 0000000069e9aac4 (&mm->mmap_sem){++++}, at: __mm_populate+0x31a/0x4d0 mm/gup.c:1250 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 which lock already depends on the new lock. vhci_hcd: default hub control req: 0000 v0000 i0000 l0 the existing dependency chain (in reverse order) is: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 -> #1 (&mm->mmap_sem){++++}: __might_fault+0x155/0x1e0 mm/memory.c:4578 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 _copy_to_user+0x30/0x110 lib/usercopy.c:25 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 copy_to_user include/linux/uaccess.h:155 [inline] mon_bin_read+0x334/0x650 drivers/usb/mon/mon_bin.c:825 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __vfs_read+0x117/0x9b0 fs/read_write.c:416 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vfs_read+0x17f/0x3c0 fs/read_write.c:452 ksys_read+0x101/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 entry_SYSCALL_64_after_hwframe+0x49/0xbe vhci_hcd: default hub control req: 0000 v0000 i0000 l0 -> #0 (&rp->fetch_lock){+.+.}: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x171/0x1700 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 mon_bin_vma_fault+0xdc/0x4a0 drivers/usb/mon/mon_bin.c:1237 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __do_fault+0xee/0x450 mm/memory.c:3240 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 do_read_fault mm/memory.c:3652 [inline] do_fault mm/memory.c:3752 [inline] handle_pte_fault mm/memory.c:3983 [inline] __handle_mm_fault+0x2b4a/0x4350 mm/memory.c:4107 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 handle_mm_fault+0x53e/0xc80 mm/memory.c:4144 faultin_page mm/gup.c:518 [inline] __get_user_pages+0x823/0x1b50 mm/gup.c:718 populate_vma_page_range+0x2db/0x3d0 mm/gup.c:1222 __mm_populate+0x286/0x4d0 mm/gup.c:1270 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 mm_populate include/linux/mm.h:2307 [inline] vm_mmap_pgoff+0x27f/0x2c0 mm/util.c:362 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 Possible unsafe locking scenario: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 CPU0 CPU1 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 ---- ---- vhci_hcd: default hub control req: 0000 v0000 i0000 l0 lock(&mm->mmap_sem); lock(&rp->fetch_lock); lock(&mm->mmap_sem); lock(&rp->fetch_lock); vhci_hcd: default hub control req: 0000 v0000 i0000 l0 *** DEADLOCK *** vhci_hcd: default hub control req: 0000 v0000 i0000 l0 1 lock held by syz-executor605/4648: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 #0: 0000000069e9aac4 (&mm->mmap_sem){++++}, at: __mm_populate+0x31a/0x4d0 mm/gup.c:1250 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 stack backtrace: CPU: 1 PID: 4648 Comm: syz-executor605 Not tainted 4.19.0-rc1+ #215 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 Call Trace: vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 print_circular_bug.isra.34.cold.55+0x1bd/0x27d kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1862 [inline] check_prevs_add kernel/locking/lockdep.c:1975 [inline] validate_chain kernel/locking/lockdep.c:2416 [inline] __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3412 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0x171/0x1700 kernel/locking/mutex.c:1073 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 mon_bin_vma_fault+0xdc/0x4a0 drivers/usb/mon/mon_bin.c:1237 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __do_fault+0xee/0x450 mm/memory.c:3240 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 do_read_fault mm/memory.c:3652 [inline] do_fault mm/memory.c:3752 [inline] handle_pte_fault mm/memory.c:3983 [inline] __handle_mm_fault+0x2b4a/0x4350 mm/memory.c:4107 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 handle_mm_fault+0x53e/0xc80 mm/memory.c:4144 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 faultin_page mm/gup.c:518 [inline] __get_user_pages+0x823/0x1b50 mm/gup.c:718 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 populate_vma_page_range+0x2db/0x3d0 mm/gup.c:1222 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __mm_populate+0x286/0x4d0 mm/gup.c:1270 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 mm_populate include/linux/mm.h:2307 [inline] vm_mmap_pgoff+0x27f/0x2c0 mm/util.c:362 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 entry_SYSCALL_64_after_hwframe+0x49/0xbe vhci_hcd: default hub control req: 0000 v0000 i0000 l0 RIP: 0033:0x444c09 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b ce fb ff c3 66 2e 0f 1f 84 00 00 00 00 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 RSP: 002b:00007ffc31ed6738 EFLAGS: 00000216 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444c09 RDX: 0000000001fffffd RSI: 0000000000400000 RDI: 0000000020a05000 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 R10: 0000000000008011 R11: 0000000000000216 R12: 0000000000401ec0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 R13: 0000000000401f50 R14: 0000000000000000 R15: 0000000000000000 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 vhci_hcd: default hub control req: 0000 v0000 i0000 l0 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches