INFO: task kworker/u8:11:16997 blocked for more than 143 seconds.
Not tainted 6.13.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:11 state:D stack:16944 pid:16997 tgid:16997 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:9)
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
exfat_write_inode+0xe5/0x1a0 fs/exfat/inode.c:108
write_inode fs/fs-writeback.c:1525 [inline]
__writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745
writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2047
wb_writeback+0x427/0xb80 fs/fs-writeback.c:2158
wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
wb_do_writeback fs/fs-writeback.c:2315 [inline]
wb_workfn+0xb94/0x1080 fs/fs-writeback.c:2343
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
3 locks held by kworker/u8:2/35:
3 locks held by kworker/u8:3/52:
#0: ffff88814d25c148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88814d25c148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc90000bc7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000bc7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
#2: ffffffff8fca04c8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4215
2 locks held by kworker/u8:5/1082:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc90003fafd00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90003fafd00 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
2 locks held by getty/5571:
#0: ffff8880357e20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:10/8497:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc9000fd47d00 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000fd47d00 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
4 locks held by kworker/u8:11/16997:
#0: ffff8880206b0948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff8880206b0948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
#1: ffffc9000b61fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000b61fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
#2: ffff888020e840e0 (&type->s_umount_key#89){++++}-{4:4}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
#3: ffff888063af00e8 (&sbi->s_lock#3){+.+.}-{4:4}, at: exfat_write_inode+0xe5/0x1a0 fs/exfat/inode.c:108
3 locks held by syz-executor/18113:
1 lock held by udevd/19943:
#0: ffffffff8eeb8c28 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x150/0x410 fs/btrfs/super.c:2238
1 lock held by udevd/19971:
#0: ffffffff8eeb8c28 (uuid_mutex){+.+.}-{4:4}, at: btrfs_control_ioctl+0x150/0x410 fs/btrfs/super.c:2238
3 locks held by syz-executor/20991:
#0: ffff88805fbc00e0 (&type->s_umount_key#75){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88805fbc00e0 (&type->s_umount_key#75){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88805fbc00e0 (&type->s_umount_key#75){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffffffff8e7d2ed0 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x3e/0x160 mm/slab_common.c:515
#2: ffffffff8ea1f4f0 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy+0x4c/0x160 mm/slab_common.c:516
3 locks held by syz-executor/21388:
2 locks held by syz.1.2149/21533:
#0: ffffffff8f041728 (bio_slab_lock){+.+.}-{4:4}, at: bio_find_or_create_slab block/bio.c:122 [inline]
#0: ffffffff8f041728 (bio_slab_lock){+.+.}-{4:4}, at: bioset_init+0x23f/0x820 block/bio.c:1796
#1: ffffffff8ea1f4f0 (slab_mutex){+.+.}-{4:4}, at: __kmem_cache_create_args+0x45/0x320 mm/slab_common.c:301
2 locks held by syz.3.2147/21532:
#0: ffffffff8eeb8c28 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree_super fs/btrfs/super.c:1841 [inline]
#0: ffffffff8eeb8c28 (uuid_mutex){+.+.}-{4:4}, at: btrfs_get_tree+0x309/0x1a30 fs/btrfs/super.c:2093
#1: ffffffff8e9f9ce8 (lock#3){+.+.}-{4:4}, at: __lru_add_drain_all+0x66/0x560 mm/swap.c:798
2 locks held by syz.2.2152/21538:
#0: ffff8880625680e0 (
&type->s_umount_key#63/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
#1: ffffffff8eeb8c28 (uuid_mutex){+.+.}-{4:4}, at: btrfs_read_chunk_tree+0x114/0x1fb0 fs/btrfs/volumes.c:7461
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xff6/0x1040 kernel/hung_task.c:397
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18113 Comm: syz-executor Not tainted 6.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
RIP: 0010:mark_lock+0x15/0x360 kernel/locking/lockdep.c:4710
Code: 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 49 89 f7 48 89 3c 24 <49> bd 00 00 00 00 00 fc ff df 83 fa 08 75 27 49 8d 5f 20 48 89 d8
RSP: 0000:ffffc900035775c8 EFLAGS: 00000082
RAX: 00000000000400a2 RBX: 1ffff11004ee78ef RCX: 00000000000400a2
RDX: 0000000000000002 RSI: ffff88802773c758 RDI: ffff88802773bc00
RBP: ffff88802773c758 R08: ffffffff94270897 R09: 1ffffffff284e112
R10: dffffc0000000000 R11: fffffbfff284e113 R12: ffff88802773c6c4
R13: ffff88802773bc00 R14: 1ffff11004ee78ef R15: ffff88802773c758
FS: 0000555575c77500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbd6bff000 CR3: 000000006c2ee000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
mark_usage kernel/locking/lockdep.c:4658 [inline]
__lock_acquire+0x117d/0x2100 kernel/locking/lockdep.c:5180
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
fs_reclaim_acquire+0xaf/0x130 mm/page_alloc.c:3868
might_alloc include/linux/sched/mm.h:318 [inline]
bdev_getblk+0x3d/0x670 fs/buffer.c:1427
__bread_gfp+0x86/0x400 fs/buffer.c:1485
sb_bread include/linux/buffer_head.h:346 [inline]
__exfat_ent_get fs/exfat/fatent.c:48 [inline]
exfat_ent_get+0x14d/0x400 fs/exfat/fatent.c:97
__exfat_free_cluster+0x56f/0x990 fs/exfat/fatent.c:200
exfat_free_cluster+0x77/0xd0 fs/exfat/fatent.c:232
__exfat_truncate+0x745/0xa60 fs/exfat/file.c:235
exfat_evict_inode+0xd8/0x270 fs/exfat/inode.c:683
evict+0x4e8/0x9a0 fs/inode.c:796
do_unlinkat+0x512/0x830 fs/namei.c:4594
__do_sys_unlink fs/namei.c:4635 [inline]
__se_sys_unlink fs/namei.c:4633 [inline]
__x64_sys_unlink+0x47/0x50 fs/namei.c:4633
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: 0033:0x7f61d83852c7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 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:00007fff636d3cd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f61d83852c7
RDX: 00007fff636d3d00 RSI: 00007fff636d3d90 RDI: 00007fff636d3d90
RBP: 00007fff636d3d90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff636d4e80
R13: 00007f61d840180c R14: 00007fff636d5f40 R15: 0000000000000022