syzbot


possible deadlock in wbt_init

Status: upstream: reported on 2025/01/14 09:37
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+2b30484722ffdf99a969@syzkaller.appspotmail.com
First crash: 4d23h, last: 4d23h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [block?] possible deadlock in wbt_init 0 (1) 2025/01/14 09:37

Sample crash report:
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc6-syzkaller-00130-g2144da25584e #0 Not tainted
------------------------------------------------------
syz.4.4235/23577 is trying to acquire lock:
ffff88802878daa8 (&q->rq_qos_mutex){+.+.}-{4:4}, at: wbt_init+0x3a0/0x510 block/blk-wbt.c:921

but task is already holding lock:
ffff88802878dde0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_register_queue+0x149/0x400 block/blk-sysfs.c:772

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&q->sysfs_lock){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       blk_mq_elv_switch_none block/blk-mq.c:4932 [inline]
       __blk_mq_update_nr_hw_queues block/blk-mq.c:5010 [inline]
       blk_mq_update_nr_hw_queues+0x3fa/0x1ae0 block/blk-mq.c:5070
       nbd_start_device+0x16c/0xaa0 drivers/block/nbd.c:1413
       nbd_start_device_ioctl drivers/block/nbd.c:1464 [inline]
       __nbd_ioctl drivers/block/nbd.c:1539 [inline]
       nbd_ioctl+0x5dc/0xf40 drivers/block/nbd.c:1579
       blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&q->q_usage_counter(io)#56){++++}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       bio_queue_enter block/blk.h:75 [inline]
       blk_mq_submit_bio+0x1536/0x2390 block/blk-mq.c:3090
       __submit_bio+0x2c6/0x560 block/blk-core.c:629
       __submit_bio_noacct_mq block/blk-core.c:710 [inline]
       submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739
       mpage_bio_submit_read fs/mpage.c:75 [inline]
       mpage_readahead+0x630/0x780 fs/mpage.c:377
       read_pages+0x176/0x750 mm/readahead.c:160
       page_cache_ra_unbounded+0x606/0x720 mm/readahead.c:295
       do_page_cache_ra mm/readahead.c:325 [inline]
       force_page_cache_ra mm/readahead.c:354 [inline]
       page_cache_sync_ra+0x3c5/0xad0 mm/readahead.c:566
       page_cache_sync_readahead include/linux/pagemap.h:1397 [inline]
       filemap_get_pages+0x605/0x2080 mm/filemap.c:2537
       filemap_read+0x452/0xf50 mm/filemap.c:2637
       blkdev_read_iter+0x2d8/0x430 block/fops.c:770
       new_sync_read fs/read_write.c:484 [inline]
       vfs_read+0x991/0xb70 fs/read_write.c:565
       ksys_read+0x18f/0x2b0 fs/read_write.c:708
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (mapping.invalidate_lock#2){++++}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       down_read+0xb1/0xa40 kernel/locking/rwsem.c:1524
       filemap_invalidate_lock_shared include/linux/fs.h:873 [inline]
       filemap_fault+0x615/0x1490 mm/filemap.c:3323
       __do_fault+0x135/0x390 mm/memory.c:4907
       do_cow_fault mm/memory.c:5352 [inline]
       do_fault mm/memory.c:5458 [inline]
       do_pte_missing mm/memory.c:3979 [inline]
       handle_pte_fault+0xcab/0x5ed0 mm/memory.c:5801
       __handle_mm_fault mm/memory.c:5944 [inline]
       handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6112
       faultin_page mm/gup.c:1196 [inline]
       __get_user_pages+0x1c82/0x49e0 mm/gup.c:1494
       populate_vma_page_range+0x264/0x330 mm/gup.c:1932
       __mm_populate+0x27a/0x460 mm/gup.c:2035
       do_mlock+0x61f/0x7e0 mm/mlock.c:653
       __do_sys_mlock mm/mlock.c:661 [inline]
       __se_sys_mlock mm/mlock.c:659 [inline]
       __x64_sys_mlock+0x60/0x70 mm/mlock.c:659
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __might_fault+0xc6/0x120 mm/memory.c:6751
       _inline_copy_from_user include/linux/uaccess.h:162 [inline]
       _copy_from_user+0x2a/0xc0 lib/usercopy.c:18
       copy_from_user include/linux/uaccess.h:212 [inline]
       __blk_trace_setup kernel/trace/blktrace.c:626 [inline]
       blk_trace_ioctl+0x1ad/0x9a0 kernel/trace/blktrace.c:740
       blkdev_ioctl+0x40c/0x6a0 block/ioctl.c:682
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:906 [inline]
       __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&q->debugfs_mutex){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       rq_qos_add+0x279/0x320 block/blk-rq-qos.c:323
       wbt_init+0x3ba/0x510 block/blk-wbt.c:922
       blk_register_queue+0x37a/0x400 block/blk-sysfs.c:795
       add_disk_fwnode+0x648/0xf80 block/genhd.c:493
       add_disk include/linux/blkdev.h:753 [inline]
       loop_add+0x81d/0xaf0 drivers/block/loop.c:2077
       loop_init+0x168/0x220 drivers/block/loop.c:2269
       do_one_initcall+0x248/0x870 init/main.c:1266
       do_initcall_level+0x157/0x210 init/main.c:1328
       do_initcalls+0x3f/0x80 init/main.c:1344
       kernel_init_freeable+0x435/0x5d0 init/main.c:1577
       kernel_init+0x1d/0x2b0 init/main.c:1466
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 (&q->rq_qos_mutex){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
       wbt_init+0x3a0/0x510 block/blk-wbt.c:921
       blk_register_queue+0x37a/0x400 block/blk-sysfs.c:795
       add_disk_fwnode+0x648/0xf80 block/genhd.c:493
       add_disk include/linux/blkdev.h:753 [inline]
       loop_add+0x81d/0xaf0 drivers/block/loop.c:2077
       blk_request_module+0x18d/0x1b0 block/genhd.c:809
       blkdev_get_no_open+0x36/0xc0 block/bdev.c:783
       bdev_file_open_by_dev+0x99/0x220 block/bdev.c:1004
       swsusp_check+0x5b/0x3f0 kernel/power/swap.c:1569
       software_resume+0x4f/0x3d0 kernel/power/hibernate.c:993
       resume_store+0x3fe/0x710 kernel/power/hibernate.c:1271
       kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0xaeb/0xd30 fs/read_write.c:679
       ksys_write+0x18f/0x2b0 fs/read_write.c:731
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &q->rq_qos_mutex --> &q->q_usage_counter(io)#56 --> &q->sysfs_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->sysfs_lock);
                               lock(&q->q_usage_counter(io)#56);
                               lock(&q->sysfs_lock);
  lock(&q->rq_qos_mutex);

 *** DEADLOCK ***

8 locks held by syz.4.4235/23577:
 #0: ffff8880688e5cf8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x254/0x320 fs/file.c:1192
 #1: ffff88807c888420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline]
 #1: ffff88807c888420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:675
 #2: ffff88801cae2488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325
 #3: ffff88801dec0d28 (kn->active#57){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326
 #4: ffffffff8e7eba48 (system_transition_mutex){+.+.}-{4:4}, at: software_resume+0x45/0x3d0 kernel/power/hibernate.c:992
 #5: ffffffff8f04f4e8 (major_names_lock){+.+.}-{4:4}, at: blk_request_module+0x33/0x1b0 block/genhd.c:806
 #6: ffff88802878de70 (&q->sysfs_dir_lock){+.+.}-{4:4}, at: blk_register_queue+0x67/0x400 block/blk-sysfs.c:761
 #7: ffff88802878dde0 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_register_queue+0x149/0x400 block/blk-sysfs.c:772

stack backtrace:
CPU: 0 UID: 0 PID: 23577 Comm: syz.4.4235 Not tainted 6.13.0-rc6-syzkaller-00130-g2144da25584e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
 wbt_init+0x3a0/0x510 block/blk-wbt.c:921
 blk_register_queue+0x37a/0x400 block/blk-sysfs.c:795
 add_disk_fwnode+0x648/0xf80 block/genhd.c:493
 add_disk include/linux/blkdev.h:753 [inline]
 loop_add+0x81d/0xaf0 drivers/block/loop.c:2077
 blk_request_module+0x18d/0x1b0 block/genhd.c:809
 blkdev_get_no_open+0x36/0xc0 block/bdev.c:783
 bdev_file_open_by_dev+0x99/0x220 block/bdev.c:1004
 swsusp_check+0x5b/0x3f0 kernel/power/swap.c:1569
 software_resume+0x4f/0x3d0 kernel/power/hibernate.c:993
 resume_store+0x3fe/0x710 kernel/power/hibernate.c:1271
 kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9534385d29
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f95351a4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9534576080 RCX: 00007f9534385d29
RDX: 0000000000000012 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007f9534401b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9534576080 R15: 00007ffd6ae7ab68
 </TASK>
block device autoloading is deprecated and will be removed.
syz.4.4235: attempt to access beyond end of device
loop0: rw=2048, sector=0, nr_sectors = 8 limit=0
PM: Image not found (code -5)

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/10 09:26 upstream 2144da25584e 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in wbt_init
* Struck through repros no longer work on HEAD.