INFO: task syz-executor.0:5049 blocked for more than 142 seconds.
Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:24096 pid:5049 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0xee1/0x59f0 kernel/sched/core.c:6710
schedule+0xe7/0x1b0 kernel/sched/core.c:6786
wb_wait_for_completion+0x1ae/0x270 fs/fs-writeback.c:192
__writeback_inodes_sb_nr+0x1d8/0x270 fs/fs-writeback.c:2650
sync_filesystem fs/sync.c:54 [inline]
sync_filesystem+0xb6/0x280 fs/sync.c:30
generic_shutdown_super+0x74/0x480 fs/super.c:472
kill_block_super+0x64/0xb0 fs/super.c:1417
deactivate_locked_super+0x9a/0x170 fs/super.c:330
deactivate_super+0xde/0x100 fs/super.c:361
cleanup_mnt+0x222/0x3d0 fs/namespace.c:1254
task_work_run+0x14d/0x240 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f820247de17
RSP: 002b:00007fffc967ea18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f820247de17
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fffc967ead0
RBP: 00007fffc967ead0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffc967fb90
R13: 00007f82024c73b9 R14: 0000000000099b99 R15: 0000000000000015
Showing all locks held in the system:
3 locks held by kworker/u4:0/10:
1 lock held by rcu_tasks_kthre/13:
#0: ffffffff8c9a67f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
#0: ffffffff8c9a64f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/28:
#0: ffffffff8c9a7400 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615
2 locks held by getty/4777:
#0: ffff888028a9d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfcb/0x1480 drivers/tty/n_tty.c:2187
1 lock held by syz-executor.0/5049:
#0: ffff88807f31c0e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:360
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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+0x2ac/0x310 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+0xf29/0x11b0 kernel/hung_task.c:379
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10 Comm: kworker/u4:0 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:207
Code: b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 dd b0 7d 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 80 b9 03 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc900000f73e0 EFLAGS: 00000293
RAX: 0000000080000000 RBX: ffffea0000e8e640 RCX: 0000000080000000
RDX: ffff888016649dc0 RSI: ffffffff81b66d9c RDI: ffffea0000e8e640
RBP: 1ffff9200001ee82 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffffffff1936441 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000000 R15: ffffea0000e8e600
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa914479670 CR3: 000000000c776000 CR4: 0000000000350ee0
Call Trace:
folio_flags.constprop.0+0xc/0x150 include/linux/page-flags.h:309
folio_test_referenced include/linux/page-flags.h:468 [inline]
folio_inc_refs mm/swap.c:422 [inline]
folio_mark_accessed+0x288/0xb10 mm/swap.c:461
__filemap_get_folio+0x3f3/0x990 mm/filemap.c:1912
grow_dev_page fs/buffer.c:1063 [inline]
grow_buffers fs/buffer.c:1123 [inline]
__getblk_slow+0x1fb/0x720 fs/buffer.c:1150
__getblk_gfp fs/buffer.c:1445 [inline]
__bread_gfp+0x215/0x310 fs/buffer.c:1479
sb_bread include/linux/buffer_head.h:351 [inline]
exfat_get_dentry_set+0x283/0xc10 fs/exfat/dir.c:878
__exfat_write_inode+0x2c0/0x9e0 fs/exfat/inode.c:45
exfat_write_inode+0xad/0x130 fs/exfat/inode.c:94
write_inode fs/fs-writeback.c:1456 [inline]
__writeback_single_inode+0xa81/0xe70 fs/fs-writeback.c:1668
writeback_sb_inodes+0x599/0x1010 fs/fs-writeback.c:1894
wb_writeback+0x2a5/0xa90 fs/fs-writeback.c:2070
wb_do_writeback fs/fs-writeback.c:2217 [inline]
wb_workfn+0x29c/0xfd0 fs/fs-writeback.c:2257
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
worker_thread+0x687/0x1110 kernel/workqueue.c:2751
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304