| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] possible deadlock in blk_request_module | 2 (3) | 2021/10/17 11:24 |
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| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] possible deadlock in blk_request_module | 2 (3) | 2021/10/17 11:24 |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| linux-5.15 | possible deadlock in blk_request_module (2) | 4 | 5 | 12d | 121d | 0/3 | upstream: reported on 2025/07/08 20:34 | |||
| linux-5.15 | possible deadlock in blk_request_module | 4 | 6 | 355d | 485d | 0/3 | auto-obsoleted due to no activity on 2025/02/24 02:18 |
======================================================
WARNING: possible circular locking dependency detected
5.15.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/19066 is trying to acquire lock:
ffffffff8c208948 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x25/0x1d0 block/genhd.c:680
but task is already holding lock:
ffffffff8b851a28 (system_transition_mutex/1){+.+.}-{3:3}, at: software_resume.part.0+0x19/0x1f0 kernel/power/hibernate.c:934
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #9 (system_transition_mutex/1){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
software_resume.part.0+0x19/0x1f0 kernel/power/hibernate.c:934
software_resume kernel/power/hibernate.c:86 [inline]
resume_store+0x161/0x190 kernel/power/hibernate.c:1181
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2161 [inline]
new_sync_write+0x429/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #8 (&of->mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
kernfs_seq_start+0x4b/0x260 fs/kernfs/file.c:112
seq_read_iter+0x2c7/0x1240 fs/seq_file.c:225
kernfs_fop_read_iter+0x44f/0x5f0 fs/kernfs/file.c:241
call_read_iter include/linux/fs.h:2155 [inline]
new_sync_read+0x421/0x6e0 fs/read_write.c:400
vfs_read+0x35c/0x600 fs/read_write.c:481
ksys_read+0x12d/0x250 fs/read_write.c:619
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #7 (&p->lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
seq_read_iter+0xdf/0x1240 fs/seq_file.c:182
call_read_iter include/linux/fs.h:2155 [inline]
generic_file_splice_read+0x453/0x6d0 fs/splice.c:311
do_splice_to+0x1bf/0x250 fs/splice.c:796
splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870
do_splice_direct+0x1b3/0x280 fs/splice.c:979
do_sendfile+0xaf2/0x1250 fs/read_write.c:1245
__do_sys_sendfile64 fs/read_write.c:1310 [inline]
__se_sys_sendfile64 fs/read_write.c:1296 [inline]
__x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #6 (sb_writers#3){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1809 [inline]
sb_start_write include/linux/fs.h:1879 [inline]
file_start_write include/linux/fs.h:3008 [inline]
lo_write_bvec drivers/block/loop.c:242 [inline]
lo_write_simple drivers/block/loop.c:265 [inline]
do_req_filebacked drivers/block/loop.c:494 [inline]
loop_handle_cmd drivers/block/loop.c:1857 [inline]
loop_process_work+0x1499/0x1db0 drivers/block/loop.c:1897
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
-> #5 ((work_completion)(&lo->rootcg_work)){+.+.}-{0:0}:
process_one_work+0x921/0x1690 kernel/workqueue.c:2274
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
-> #4 ((wq_completion)loop1){+.+.}-{0:0}:
flush_workqueue+0x110/0x15b0 kernel/workqueue.c:2818
drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2983
destroy_workqueue+0x71/0x800 kernel/workqueue.c:4420
__loop_clr_fd+0x1de/0x1070 drivers/block/loop.c:1124
lo_release+0x1ac/0x1f0 drivers/block/loop.c:1761
blkdev_put_whole block/bdev.c:694 [inline]
blkdev_put+0x2fb/0x9e0 block/bdev.c:956
blkdev_close+0x6a/0x80 block/fops.c:515
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #3 (&lo->lo_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
lo_open+0x75/0x120 drivers/block/loop.c:1733
blkdev_get_whole+0x99/0x2d0 block/bdev.c:671
blkdev_get_by_dev.part.0+0x354/0xb50 block/bdev.c:826
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
blkdev_open+0x154/0x2e0 block/fops.c:501
do_dentry_open+0x4c8/0x11d0 fs/open.c:822
do_open fs/namei.c:3426 [inline]
path_openat+0x1c9a/0x2740 fs/namei.c:3559
do_filp_open+0x1aa/0x400 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1200
do_sys_open fs/open.c:1216 [inline]
__do_sys_open fs/open.c:1224 [inline]
__se_sys_open fs/open.c:1220 [inline]
__x64_sys_open+0x119/0x1c0 fs/open.c:1220
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #2 (&disk->open_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
bd_register_pending_holders+0x2c/0x470 block/holder.c:161
device_add_disk+0x752/0xfa0 block/genhd.c:478
add_disk include/linux/genhd.h:212 [inline]
md_alloc+0x90c/0x1060 drivers/md/md.c:5717
md_probe+0x69/0x70 drivers/md/md.c:5745
blk_request_module+0x111/0x1d0 block/genhd.c:683
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:742
blkdev_get_by_dev.part.0+0x22/0xb50 block/bdev.c:806
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
journal_init_dev fs/reiserfs/journal.c:2614 [inline]
journal_init+0xb5c/0x6570 fs/reiserfs/journal.c:2775
reiserfs_fill_super+0xc57/0x2f90 fs/reiserfs/super.c:2028
mount_bdev+0x34d/0x410 fs/super.c:1368
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1498
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3318
do_mount fs/namespace.c:3331 [inline]
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #1 (disks_mutex){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
md_alloc+0x37/0x1060 drivers/md/md.c:5658
md_probe+0x69/0x70 drivers/md/md.c:5745
blk_request_module+0x111/0x1d0 block/genhd.c:683
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:742
blkdev_get_by_dev.part.0+0x22/0xb50 block/bdev.c:806
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
journal_init_dev fs/reiserfs/journal.c:2614 [inline]
journal_init+0xb5c/0x6570 fs/reiserfs/journal.c:2775
reiserfs_fill_super+0xc57/0x2f90 fs/reiserfs/super.c:2028
mount_bdev+0x34d/0x410 fs/super.c:1368
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1498
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3318
do_mount fs/namespace.c:3331 [inline]
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #0 (major_names_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3051 [inline]
check_prevs_add kernel/locking/lockdep.c:3174 [inline]
validate_chain kernel/locking/lockdep.c:3789 [inline]
__lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
blk_request_module+0x25/0x1d0 block/genhd.c:680
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:742
blkdev_get_by_dev.part.0+0x22/0xb50 block/bdev.c:806
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
swsusp_check+0x97/0x2f0 kernel/power/swap.c:1520
software_resume.part.0+0x102/0x1f0 kernel/power/hibernate.c:979
software_resume kernel/power/hibernate.c:86 [inline]
resume_store+0x161/0x190 kernel/power/hibernate.c:1181
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2161 [inline]
new_sync_write+0x429/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
major_names_lock --> &of->mutex --> system_transition_mutex/1
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(system_transition_mutex/1);
lock(&of->mutex);
lock(system_transition_mutex/1);
lock(major_names_lock);
*** DEADLOCK ***
5 locks held by syz-executor.2/19066:
#0: ffff88801a3b6370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
#1: ffff88807f3f0460 (sb_writers#6){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:643
#2: ffff8880795ed088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x287/0x500 fs/kernfs/file.c:287
#3: ffff8880157d3830 (kn->active#761){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2ab/0x500 fs/kernfs/file.c:288
#4: ffffffff8b851a28 (system_transition_mutex/1){+.+.}-{3:3}, at: software_resume.part.0+0x19/0x1f0 kernel/power/hibernate.c:934
stack backtrace:
CPU: 1 PID: 19066 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2131
check_prev_add kernel/locking/lockdep.c:3051 [inline]
check_prevs_add kernel/locking/lockdep.c:3174 [inline]
validate_chain kernel/locking/lockdep.c:3789 [inline]
__lock_acquire+0x2a07/0x54a0 kernel/locking/lockdep.c:5015
lock_acquire kernel/locking/lockdep.c:5625 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
__mutex_lock_common kernel/locking/mutex.c:607 [inline]
__mutex_lock+0x12f/0x12f0 kernel/locking/mutex.c:740
blk_request_module+0x25/0x1d0 block/genhd.c:680
blkdev_get_no_open+0x178/0x1e0 block/bdev.c:742
blkdev_get_by_dev.part.0+0x22/0xb50 block/bdev.c:806
blkdev_get_by_dev+0x6b/0x80 block/bdev.c:859
swsusp_check+0x97/0x2f0 kernel/power/swap.c:1520
software_resume.part.0+0x102/0x1f0 kernel/power/hibernate.c:979
software_resume kernel/power/hibernate.c:86 [inline]
resume_store+0x161/0x190 kernel/power/hibernate.c:1181
kobj_attr_store+0x50/0x80 lib/kobject.c:856
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2161 [inline]
new_sync_write+0x429/0x660 fs/read_write.c:503
vfs_write+0x7cd/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9a6ee60ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9a6c3d6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9a6ef73f60 RCX: 00007f9a6ee60ae9
RDX: 000000002000fdef RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f9a6eebaf25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffefa10a2bf R14: 00007f9a6c3d6300 R15: 0000000000022000
</TASK>
PM: Image not found (code -5)
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021/11/06 21:20 | upstream | d4439a1189f9 | 4c1be0be | .config | console log | report | info | ci-upstream-kasan-gce-root | possible deadlock in blk_request_module | |||
| 2021/09/19 00:34 | upstream | 93ff9f13be91 | 70b76c1d | .config | console log | report | info | ci-upstream-kasan-gce-root | possible deadlock in blk_request_module |