INFO: task kworker/u4:8:1080 blocked for more than 143 seconds.
Not tainted 6.6.0-rc6-next-20231018-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8 state:D stack:21824 pid:1080 tgid:1080 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:2)
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xee4/0x5a10 kernel/sched/core.c:6680
__schedule_loop kernel/sched/core.c:6757 [inline]
schedule+0xe7/0x270 kernel/sched/core.c:6772
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6829
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x969/0x1340 kernel/locking/mutex.c:747
fat_write_inode fs/fat/inode.c:918 [inline]
fat_write_inode+0xfc/0x180 fs/fat/inode.c:911
write_inode fs/fs-writeback.c:1456 [inline]
__writeback_single_inode+0xa84/0xe60 fs/fs-writeback.c:1673
writeback_sb_inodes+0x5a2/0x1090 fs/fs-writeback.c:1899
__writeback_inodes_wb+0xff/0x2d0 fs/fs-writeback.c:1970
wb_writeback+0x7fe/0xaa0 fs/fs-writeback.c:2077
wb_check_background_flush fs/fs-writeback.c:2147 [inline]
wb_do_writeback fs/fs-writeback.c:2235 [inline]
wb_workfn+0x86a/0xfd0 fs/fs-writeback.c:2262
process_one_work+0x8a2/0x15e0 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cbacbe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8cbacbe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8cbacbe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
4 locks held by kworker/u4:2/42:
#0: ffff88801469dd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x15e0 kernel/workqueue.c:2605
#1: ffffc90000b2fd80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7f4/0x15e0 kernel/workqueue.c:2606
#2: ffff8880222740e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:610
#3: ffff88801ebcc1d0 (&sbi->s_lock){+.+.}-{3:3}, at: fat_write_inode fs/fat/inode.c:918 [inline]
#3: ffff88801ebcc1d0 (&sbi->s_lock){+.+.}-{3:3}, at: fat_write_inode+0xfc/0x180 fs/fat/inode.c:911
4 locks held by kworker/u4:8/1080:
#0: ffff88801469dd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x78a/0x15e0 kernel/workqueue.c:2605
#1: ffffc900052b7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7f4/0x15e0 kernel/workqueue.c:2606
#2: ffff88804ce440e0 (&type->s_umount_key#60){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:610
#3: ffff88807d0701d0 (&sbi->s_lock){+.+.}-{3:3}, at: fat_write_inode fs/fat/inode.c:918 [inline]
#3: ffff88807d0701d0 (&sbi->s_lock){+.+.}-{3:3}, at: fat_write_inode+0xfc/0x180 fs/fat/inode.c:911
2 locks held by getty/4808:
#0: ffff8880266370a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
3 locks held by syz-executor.2/6641:
4 locks held by syz-executor.3/6691:
2 locks held by syz-executor.5/7371:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc6-next-20231018-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf87/0x1210 kernel/hung_task.c:379
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6691 Comm: syz-executor.3 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:match_held_lock+0x1/0xa0 kernel/locking/lockdep.c:5199
Code: 04 85 c0 75 df 48 c7 c6 00 bc 8c 8a 48 c7 c7 80 bb 8c 8a e8 c1 c8 04 f7 0f 0b eb c8 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 53 <48> 39 77 10 48 89 fb 74 61 66 83 7f 22 1f 76 56 48 8b 46 08 48 89
RSP: 0018:ffffc900062875c8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff88801f586400 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff888148c5b698 RDI: ffff88801f586400
RBP: ffff888148c5b698 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 1ffffffff1976fb9 R12: ffff88801f585940
R13: ffff88801f586400 R14: 00000000ffffffff R15: 0000000000000000
FS: 00007f2a6f91d6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001a77000 CR3: 00000000208ff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_is_held kernel/locking/lockdep.c:5494 [inline]
lock_is_held_type+0xad/0x140 kernel/locking/lockdep.c:5824
lock_is_held include/linux/lockdep.h:288 [inline]
xa_entry include/linux/xarray.h:1216 [inline]
xas_descend+0x2b6/0x4e0 lib/xarray.c:206
xas_load+0xe0/0x140 lib/xarray.c:244
filemap_get_entry+0x10f/0x460 mm/filemap.c:1806
__filemap_get_folio+0x56/0xa90 mm/filemap.c:1851
grow_dev_folio fs/buffer.c:1043 [inline]
grow_buffers fs/buffer.c:1111 [inline]
__getblk_slow+0x1b1/0x6b0 fs/buffer.c:1138
bdev_getblk+0xad/0xc0 fs/buffer.c:1434
__getblk include/linux/buffer_head.h:358 [inline]
sb_getblk include/linux/buffer_head.h:364 [inline]
fat_mirror_bhs+0x244/0x5d0 fs/fat/fatent.c:388
fat_alloc_clusters+0xcb2/0xf70 fs/fat/fatent.c:543
fat_alloc_new_dir+0x107/0xc90 fs/fat/dir.c:1144
vfat_mkdir+0x151/0x350 fs/fat/namei_vfat.c:859
vfs_mkdir+0x577/0x820 fs/namei.c:4105
do_mkdirat+0x2fd/0x3a0 fs/namei.c:4128
__do_sys_mkdirat fs/namei.c:4143 [inline]
__se_sys_mkdirat fs/namei.c:4141 [inline]
__x64_sys_mkdirat+0x115/0x170 fs/namei.c:4141
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f2a6ec7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2a6f91d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2a6ed9bf80 RCX: 00007f2a6ec7cae9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f2a6ecc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f2a6ed9bf80 R15: 00007ffe041fb288