INFO: task kworker/u4:8:7213 blocked for more than 143 seconds.
Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8 state:D stack:24160 pid: 7213 ppid: 2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:4)
Call Trace:
context_switch kernel/sched/core.c:5182 [inline]
__schedule+0x91f/0xdf0 kernel/sched/core.c:6494
schedule+0xcb/0x190 kernel/sched/core.c:6570
schedule_timeout+0x98/0x2f0 kernel/time/timer.c:1911
do_wait_for_common+0x3ea/0x560 kernel/sched/completion.c:85
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x46/0x60 kernel/sched/completion.c:138
f2fs_issue_checkpoint+0x355/0x4a0
f2fs_balance_fs_bg+0x4a8/0x920 fs/f2fs/segment.c:484
f2fs_write_node_pages+0x134/0x6b0 fs/f2fs/node.c:2104
do_writepages+0x3c3/0x680 mm/page-writeback.c:2468
__writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587
writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1865
__writeback_inodes_wb+0x125/0x420 fs/fs-writeback.c:1936
wb_writeback+0x440/0x7b0 fs/fs-writeback.c:2041
wb_check_old_data_flush fs/fs-writeback.c:2141 [inline]
wb_do_writeback fs/fs-writeback.c:2194 [inline]
wb_workfn+0xa78/0xef0 fs/fs-writeback.c:2222
process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
#0:
ffffffff8cb233f0
(
rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/14:
#0:
ffffffff8cb23bf0
(
rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/29:
#0:
ffffffff8cb23220
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3293:
#0:
ffff88814ab2e098
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1:
ffffc90002d232f0
(
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x53b/0x1650 drivers/tty/n_tty.c:2177
5 locks held by f2fs_ckpt-7:4/6020:
3 locks held by kworker/u4:8/7213:
#0:
ffff888017b55138
(
(wq_completion)writeback
){+.+.}-{0:0}
, at: process_one_work+0x7f2/0xdb0
#1:
ffffc90005d2fd00
(
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x831/0xdb0 kernel/workqueue.c:2264
#2:
ffff888078cb60e0
(
&type->s_umount_key
#93
){++++}-{3:3}
, at: trylock_super+0x1b/0xf0 fs/super.c:415
2 locks held by syz-executor.2/12763:
#0: ffff888078cb60e0 (&type->s_umount_key#93
){++++}-{3:3}
, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
#1:
ffff88801e7b67d0
(
&bdi->wb_switch_rwsem
){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
){+.+.}-{3:3}, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691
2 locks held by syz-executor.2/12887:
#0:
ffff888078cb60e0
(&type->s_umount_key
#93
){++++}-{3:3}
, at: iterate_supers+0xb0/0x1f0 fs/super.c:721
#1:
ffff88801e7b67d0
(
&bdi->wb_switch_rwsem
){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x264/0xaa0 fs/fs-writeback.c:2691
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
nmi_cpu_backtrace+0x425/0x450 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xcd5/0xd20 kernel/hung_task.c:369
kthread+0x266/0x300 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: 6020 Comm: f2fs_ckpt-7:4 Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:io_serial_in+0x71/0xb0 drivers/tty/serial/8250/8250_port.c:460
Code: 85 e6 d6 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 d6 d2 29 fd 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ad 48 89 ef
RSP: 0018:ffffc90005566618 EFLAGS: 00000002
RAX: 1ffffffff2331060 RBX: ffffffff91988480 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff84b0a371 R09: ffffed1028dc8047
R10: ffffed1028dc8047 R11: 1ffff11028dc8046 R12: 0000000000000000
R13: ffffffff91988490 R14: 00000000000003fd R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000717a20 CR3: 0000000025f1d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:118 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:140 [inline]
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2073 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3343 [inline]
serial8250_console_write+0x11ae/0x1950 drivers/tty/serial/8250/8250_port.c:3425
call_console_driver kernel/printk/printk.c:1945 [inline]
console_emit_next_record+0x778/0xa40 kernel/printk/printk.c:2732
console_unlock+0x26b/0x6f0 kernel/printk/printk.c:2861
vprintk_emit+0xd1/0x1e0 kernel/printk/printk.c:2271
_printk+0xc0/0x100 kernel/printk/printk.c:2292
printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
show_trace_log_lvl+0x550/0x5d0 arch/x86/kernel/dumpstack.c:276
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
f2fs_is_valid_blkaddr+0xc34/0x1200 fs/f2fs/checkpoint.c:193
f2fs_do_write_data_page+0x7e2/0x24a0 fs/f2fs/data.c:2646
f2fs_write_single_data_page+0xa5c/0x1c90 fs/f2fs/data.c:2801
f2fs_write_cache_pages+0xf6e/0x2330 fs/f2fs/data.c:3076
__f2fs_write_data_pages fs/f2fs/data.c:3226 [inline]
f2fs_write_data_pages+0x82a/0xc90 fs/f2fs/data.c:3253
do_writepages+0x3c3/0x680 mm/page-writeback.c:2468
filemap_fdatawrite_wbc+0x11e/0x170 mm/filemap.c:388
__filemap_fdatawrite_range mm/filemap.c:421 [inline]
__filemap_fdatawrite mm/filemap.c:427 [inline]
filemap_fdatawrite+0x146/0x1d0 mm/filemap.c:432
f2fs_sync_dirty_inodes+0x274/0x5c0 fs/f2fs/checkpoint.c:1093
block_operations fs/f2fs/checkpoint.c:1224 [inline]
f2fs_write_checkpoint+0xbe5/0x1d70 fs/f2fs/checkpoint.c:1633
__write_checkpoint_sync fs/f2fs/checkpoint.c:1750 [inline]
__checkpoint_and_complete_reqs+0xd1/0x3a0 fs/f2fs/checkpoint.c:1769
issue_checkpoint_thread+0xdc/0x280 fs/f2fs/checkpoint.c:1800
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306