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| Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| upstream | possible deadlock in ocfs2_page_mkwrite ocfs2 | 167 | 13h16m | 54d | 0/28 | upstream: reported on 2024/09/12 09:35 | |||
| linux-5.15 | possible deadlock in ocfs2_page_mkwrite | 2 | 38d | 49d | 0/3 | upstream: reported on 2024/09/16 20:58 |
======================================================
WARNING: possible circular locking dependency detected
6.1.115-syzkaller #0 Not tainted
------------------------------------------------------
syz.3.398/6371 is trying to acquire lock:
ffff0000e1285be0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142
but task is already holding lock:
ffff0000ccf22558 (sb_pagefaults#5){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (sb_pagefaults#5){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1891 [inline]
sb_start_pagefault include/linux/fs.h:1995 [inline]
ocfs2_page_mkwrite+0x1d4/0xdd4 fs/ocfs2/mmap.c:122
do_page_mkwrite+0x144/0x37c mm/memory.c:3009
wp_page_shared+0x148/0x550 mm/memory.c:3358
do_wp_page+0xcbc/0xf44 mm/memory.c:3508
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x19a4/0x3d38 mm/memory.c:5292
__do_page_fault arch/arm64/mm/fault.c:499 [inline]
do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583
do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803
el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
file_ioctl fs/ioctl.c:327 [inline]
do_vfs_ioctl+0x2044/0x26f8 fs/ioctl.c:849
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #1 (&mm->mmap_lock){++++}-{3:3}:
__might_fault+0xc4/0x124 mm/memory.c:5851
_copy_to_user include/linux/uaccess.h:143 [inline]
copy_to_user include/linux/uaccess.h:169 [inline]
fiemap_fill_next_extent+0x1b4/0x424 fs/ioctl.c:144
ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline]
ocfs2_fiemap+0x994/0xc78 fs/ocfs2/extent_map.c:762
ioctl_fiemap fs/ioctl.c:219 [inline]
do_vfs_ioctl+0x194c/0x26f8 fs/ioctl.c:810
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142
do_page_mkwrite+0x144/0x37c mm/memory.c:3009
wp_page_shared+0x148/0x550 mm/memory.c:3358
do_wp_page+0xcbc/0xf44 mm/memory.c:3508
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x19a4/0x3d38 mm/memory.c:5292
__do_page_fault arch/arm64/mm/fault.c:499 [inline]
do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583
do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803
el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
file_ioctl fs/ioctl.c:327 [inline]
do_vfs_ioctl+0x2044/0x26f8 fs/ioctl.c:849
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
other info that might help us debug this:
Chain exists of:
&ocfs2_file_ip_alloc_sem_key --> &mm->mmap_lock --> sb_pagefaults#5
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_pagefaults#5);
lock(&mm->mmap_lock);
lock(sb_pagefaults#5);
lock(&ocfs2_file_ip_alloc_sem_key);
*** DEADLOCK ***
2 locks held by syz.3.398/6371:
#0: ffff0000cf6ba548 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff0000cf6ba548 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
#0: ffff0000cf6ba548 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x38/0x2e8 mm/memory.c:5382
#1: ffff0000ccf22558 (sb_pagefaults#5){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009
stack backtrace:
CPU: 0 PID: 6371 Comm: syz.3.398 Not tainted 6.1.115-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x58 lib/dump_stack.c:113
print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
ocfs2_page_mkwrite+0x388/0xdd4 fs/ocfs2/mmap.c:142
do_page_mkwrite+0x144/0x37c mm/memory.c:3009
wp_page_shared+0x148/0x550 mm/memory.c:3358
do_wp_page+0xcbc/0xf44 mm/memory.c:3508
handle_pte_fault mm/memory.c:5047 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x19a4/0x3d38 mm/memory.c:5292
__do_page_fault arch/arm64/mm/fault.c:499 [inline]
do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583
do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803
el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
file_ioctl fs/ioctl.c:327 [inline]
do_vfs_ioctl+0x2044/0x26f8 fs/ioctl.c:849
__do_sys_ioctl fs/ioctl.c:868 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024/11/04 07:04 | linux-6.1.y | 7c15117f9468 | f00eed24 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-6-1-kasan-arm64 | possible deadlock in ocfs2_page_mkwrite |