| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] [btrfs?] possible deadlock in btrfs_dirty_inode (2) | 0 (1) | 2024/12/16 02:12 |
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| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] [btrfs?] possible deadlock in btrfs_dirty_inode (2) | 0 (1) | 2024/12/16 02:12 |
| Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| linux-5.15 | possible deadlock in btrfs_dirty_inode (2) | 2 | 336d | 398d | 0/3 | auto-obsoleted due to no activity on 2024/09/22 15:54 | |||
| linux-5.15 | possible deadlock in btrfs_dirty_inode (3) origin:lts-only | C | inconclusive | 4 | 46d | 158d | 0/3 | upstream: reported C repro on 2024/12/09 11:33 | |
| linux-5.15 | possible deadlock in btrfs_dirty_inode | 3 | 696d | 715d | 0/3 | auto-obsoleted due to no activity on 2023/09/28 23:24 | |||
| upstream | possible deadlock in btrfs_dirty_inode btrfs | C | error | done | 48 | 902d | 914d | 0/28 | auto-obsoleted due to no activity on 2023/05/16 05:18 |
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 Not tainted
------------------------------------------------------
syz.2.1006/14351 is trying to acquire lock:
ffff8880685b0610 (sb_internal#2){.+.+}-{0:0}, at: btrfs_dirty_inode+0x9f/0x190 fs/btrfs/inode.c:6136
but task is already holding lock:
ffff8880685b0518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #7 (sb_pagefaults#8){.+.+}-{0:0}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
__sb_start_write include/linux/fs.h:1783 [inline]
sb_start_pagefault include/linux/fs.h:1948 [inline]
btrfs_page_mkwrite+0x3b2/0x16a0 fs/btrfs/file.c:1798
do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
wp_page_shared mm/memory.c:3688 [inline]
do_wp_page+0x2626/0x5760 mm/memory.c:3907
handle_pte_fault mm/memory.c:6013 [inline]
__handle_mm_fault+0x1028/0x5380 mm/memory.c:6140
handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
-> #6 (vm_lock){++++}-{0:0}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__vma_enter_locked+0x182/0x380 mm/memory.c:6473
__vma_start_write+0x1e/0x120 mm/memory.c:6497
vma_start_write include/linux/mm.h:829 [inline]
mprotect_fixup+0x571/0x9b0 mm/mprotect.c:670
setup_arg_pages+0x53a/0xaa0 fs/exec.c:780
load_elf_binary+0xb71/0x27a0 fs/binfmt_elf.c:1020
search_binary_handler fs/exec.c:1778 [inline]
exec_binprm fs/exec.c:1810 [inline]
bprm_execve+0x999/0x1440 fs/exec.c:1862
kernel_execve+0x8f0/0x9f0 fs/exec.c:2028
try_to_run_init_process+0x13/0x60 init/main.c:1385
kernel_init+0xad/0x1d0 init/main.c:1513
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #5 (&mm->mmap_lock){++++}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
down_read_killable+0x50/0x350 kernel/locking/rwsem.c:1547
mmap_read_lock_killable+0x1d/0x70 include/linux/mmap_lock.h:193
get_mmap_lock_carefully mm/memory.c:6355 [inline]
lock_mm_and_find_vma+0x2a8/0x300 mm/memory.c:6406
do_user_addr_fault+0x331/0x1390 arch/x86/mm/fault.c:1360
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
user_access_begin arch/x86/include/asm/uaccess.h:-1 [inline]
filldir+0x299/0x690 fs/readdir.c:286
dir_emit include/linux/fs.h:3861 [inline]
kernfs_fop_readdir+0x534/0x870 fs/kernfs/dir.c:1907
iterate_dir+0x5ac/0x770 fs/readdir.c:108
__do_sys_getdents fs/readdir.c:322 [inline]
__se_sys_getdents+0xe4/0x250 fs/readdir.c:308
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #4 (&root->kernfs_rwsem){++++}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
kernfs_add_one+0x41/0x520 fs/kernfs/dir.c:791
kernfs_create_dir_ns+0xde/0x130 fs/kernfs/dir.c:1091
sysfs_create_dir_ns+0x123/0x280 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x59f/0xb40 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_init_and_add+0x125/0x190 lib/kobject.c:457
btrfs_sysfs_add_qgroups+0x111/0x2b0 fs/btrfs/sysfs.c:2616
btrfs_quota_enable+0x278/0x1d50 fs/btrfs/qgroup.c:1030
btrfs_ioctl_quota_ctl+0x183/0x1c0 fs/btrfs/ioctl.c:3676
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #3 (&fs_info->qgroup_ioctl_lock){+.+.}-{4:4}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
btrfs_quota_enable+0x2be/0x1d50 fs/btrfs/qgroup.c:1059
btrfs_ioctl_quota_ctl+0x183/0x1c0 fs/btrfs/ioctl.c:3676
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #2 (btrfs_trans_num_extwriters){++++}-{0:0}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
join_transaction+0x1a4/0xd70 fs/btrfs/transaction.c:321
start_transaction+0x6ae/0x1620 fs/btrfs/transaction.c:705
_btrfs_ioctl_set_received_subvol+0x153/0xae0 fs/btrfs/ioctl.c:4018
btrfs_ioctl_set_received_subvol+0x8d/0x100 fs/btrfs/ioctl.c:4134
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (btrfs_trans_num_writers){++++}-{0:0}:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
join_transaction+0x182/0xd70 fs/btrfs/transaction.c:320
start_transaction+0x6ae/0x1620 fs/btrfs/transaction.c:705
_btrfs_ioctl_set_received_subvol+0x153/0xae0 fs/btrfs/ioctl.c:4018
btrfs_ioctl_set_received_subvol+0x8d/0x100 fs/btrfs/ioctl.c:4134
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (sb_internal#2){.+.+}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
__lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
__sb_start_write include/linux/fs.h:1783 [inline]
sb_start_intwrite include/linux/fs.h:1966 [inline]
start_transaction+0x566/0x1620 fs/btrfs/transaction.c:699
btrfs_dirty_inode+0x9f/0x190 fs/btrfs/inode.c:6136
inode_update_time fs/inode.c:2076 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x344/0x490 fs/inode.c:2335
btrfs_page_mkwrite+0x634/0x16a0 fs/btrfs/file.c:1814
do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
wp_page_shared mm/memory.c:3688 [inline]
do_wp_page+0x2626/0x5760 mm/memory.c:3907
handle_pte_fault mm/memory.c:6013 [inline]
__handle_mm_fault+0x1028/0x5380 mm/memory.c:6140
handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
other info that might help us debug this:
Chain exists of:
sb_internal#2 --> vm_lock --> sb_pagefaults#8
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(sb_pagefaults#8);
lock(vm_lock);
lock(sb_pagefaults#8);
rlock(sb_internal#2);
*** DEADLOCK ***
2 locks held by syz.2.1006/14351:
#0: ffff8880280d9a88 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x2d9/0x1390 arch/x86/mm/fault.c:1328
#1: ffff8880685b0518 (sb_pagefaults#8){.+.+}-{0:0}, at: do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
stack backtrace:
CPU: 0 UID: 0 PID: 14351 Comm: syz.2.1006 Not tainted 6.15.0-rc6-syzkaller-00105-g088d13246a46 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
__lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
__sb_start_write include/linux/fs.h:1783 [inline]
sb_start_intwrite include/linux/fs.h:1966 [inline]
start_transaction+0x566/0x1620 fs/btrfs/transaction.c:699
btrfs_dirty_inode+0x9f/0x190 fs/btrfs/inode.c:6136
inode_update_time fs/inode.c:2076 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x344/0x490 fs/inode.c:2335
btrfs_page_mkwrite+0x634/0x16a0 fs/btrfs/file.c:1814
do_page_mkwrite+0x14a/0x310 mm/memory.c:3287
wp_page_shared mm/memory.c:3688 [inline]
do_wp_page+0x2626/0x5760 mm/memory.c:3907
handle_pte_fault mm/memory.c:6013 [inline]
__handle_mm_fault+0x1028/0x5380 mm/memory.c:6140
handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f53ab5566d8
Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5
RSP: 002b:00007ffef29d89f8 EFLAGS: 00010246
RAX: 0000200000000040 RBX: 0000000000000004 RCX: 0030656c69662f2e
RDX: 0000000000000008 RSI: 0030656c69662f2e RDI: 0000200000000040
RBP: 00007f53ab7b7ba0 R08: 00007f53ab400000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 00007f53ab7b5fac
R13: 00007f53ab7b5fa0 R14: fffffffffffffffe R15: 00007ffef29d8b10
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/05/15 17:49 | upstream | 088d13246a46 | cfde8269 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in btrfs_dirty_inode | ||
| 2025/05/06 10:47 | upstream | 01f95500a162 | ae98e6b9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in btrfs_dirty_inode | ||
| 2025/04/10 05:55 | upstream | 3b07108ada81 | 988b336c | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in btrfs_dirty_inode | ||
| 2025/01/09 05:00 | upstream | 0b7958fa05d5 | f3558dbf | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | possible deadlock in btrfs_dirty_inode | ||
| 2024/12/26 22:14 | upstream | d6ef8b40d075 | d3ccff63 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | possible deadlock in btrfs_dirty_inode | ||
| 2024/12/12 02:06 | upstream | 231825b2e1ff | ff949d25 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-badwrites-root | possible deadlock in btrfs_dirty_inode |