INFO: task syz-executor.0:3585 blocked for more than 143 seconds.
Not tainted 6.1.34-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:19832 pid:3585 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x132c/0x4330 kernel/sched/core.c:6554
schedule+0xbf/0x180 kernel/sched/core.c:6630
wb_wait_for_completion+0x162/0x290 fs/fs-writeback.c:191
sync_inodes_sb+0x293/0xab0 fs/fs-writeback.c:2717
sync_filesystem+0x16b/0x220 fs/sync.c:64
generic_shutdown_super+0x6b/0x340 fs/super.c:474
kill_block_super+0x7a/0xe0 fs/super.c:1450
deactivate_locked_super+0xa0/0x110 fs/super.c:332
cleanup_mnt+0x490/0x520 fs/namespace.c:1186
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f18f568d7f7
RSP: 002b:00007ffdcec25058 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f18f568d7f7
RDX: 00007ffdcec2512b RSI: 000000000000000a RDI: 00007ffdcec25120
RBP: 00007ffdcec25120 R08: 00000000ffffffff R09: 00007ffdcec24ef0
R10: 0000555555647893 R11: 0000000000000246 R12: 00007f18f56d643b
R13: 00007ffdcec261e0 R14: 0000555555647810 R15: 00007ffdcec26220
Showing all locks held in the system:
2 locks held by kworker/u4:0/9:
#0: ffff888014af4938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0
#1: ffffc900000e7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2264
5 locks held by kworker/u4:1/11:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cf27470 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cf27c70 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
#0: ffffffff8cf272a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3301:
#0: ffff8880280a3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2177
2 locks held by syz-executor.0/3585:
#0: ffff88807766c0e0 (&type->s_umount_key#68){+.+.}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:362
#1: ffff88814475c7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
#1: ffff88814475c7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x274/0xab0 fs/fs-writeback.c:2715
4 locks held by kworker/u4:8/4414:
1 lock held by segctord/9091:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.34-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf18/0xf60 kernel/hung_task.c:377
kthread+0x26e/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9091 Comm: segctord Not tainted 6.1.34-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:215 [inline]
RIP: 0010:delay_tsc+0x6f/0xd0 arch/x86/lib/delay.c:72
Code: 00 e8 45 72 dd f6 65 8b 05 16 ee 81 75 85 c0 74 2f f3 90 bf 01 00 00 00 e8 ae 70 dd f6 e8 b9 ee 02 00 41 39 c7 75 20 0f 01 f9 <66> 90 48 89 d5 48 c1 e5 20 48 09 c5 48 29 dd 49 39 ee 77 be eb 23
RSP: 0018:ffffc900126e6dd8 EFLAGS: 00000046
RAX: 00000000e23fafb1 RBX: 00000185e23faec4 RCX: 0000000000000001
RDX: 0000000000000185 RSI: ffffffff8b3cc980 RDI: ffffffff8b3cc940
RBP: 0000000000000027 R08: ffffffff84acefb6 R09: ffffed1003e18047
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff91ac5e30
R13: 00000000000026fc R14: 0000000000000899 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009b3bf08 CR3: 0000000076e89000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2109 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3374 [inline]
serial8250_console_write+0x100a/0x1750 drivers/tty/serial/8250/8250_port.c:3452
call_console_driver kernel/printk/printk.c:1942 [inline]
console_emit_next_record+0xa78/0xda0 kernel/printk/printk.c:2731
console_unlock+0x278/0x6e0 kernel/printk/printk.c:2860
vprintk_emit+0xd1/0x1f0 kernel/printk/printk.c:2268
_printk+0xd1/0x111 kernel/printk/printk.c:2289
dump_stack_print_info+0x124/0x140 lib/dump_stack.c:66
__dump_stack lib/dump_stack.c:87 [inline]
dump_stack_lvl+0x1d7/0x2cb lib/dump_stack.c:106
__getblk_slow fs/buffer.c:1026 [inline]
__getblk_gfp+0x978/0xa20 fs/buffer.c:1333
sb_getblk include/linux/buffer_head.h:356 [inline]
nilfs_segbuf_extend_segsum fs/nilfs2/segbuf.c:99 [inline]
nilfs_segbuf_reset+0xd7/0x320 fs/nilfs2/segbuf.c:129
nilfs_segctor_reset_segment_buffer fs/nilfs2/segment.c:421 [inline]
nilfs_segctor_collect fs/nilfs2/segment.c:1518 [inline]
nilfs_segctor_do_construct+0x1385/0x6cc0 fs/nilfs2/segment.c:2068
nilfs_segctor_construct+0x145/0x8c0 fs/nilfs2/segment.c:2402
nilfs_segctor_thread_construct fs/nilfs2/segment.c:2510 [inline]
nilfs_segctor_thread+0x536/0x1130 fs/nilfs2/segment.c:2593
kthread+0x26e/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306