INFO: task kworker/u4:104:6512 blocked for more than 143 seconds.
Not tainted 6.1.27-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:104 state:D stack:23808 pid:6512 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
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
rwsem_down_write_slowpath+0xe93/0x14a0 kernel/locking/rwsem.c:1189
f2fs_down_write fs/f2fs/f2fs.h:2207 [inline]
f2fs_balance_fs+0x4fb/0x6c0 fs/f2fs/segment.c:418
f2fs_write_inode+0x4c3/0x540 fs/f2fs/inode.c:757
write_inode fs/fs-writeback.c:1443 [inline]
__writeback_single_inode+0x67d/0x11e0 fs/fs-writeback.c:1655
writeback_sb_inodes+0xc21/0x1ac0 fs/fs-writeback.c:1881
__writeback_inodes_wb+0x114/0x400 fs/fs-writeback.c:1952
wb_writeback+0x4b1/0xe10 fs/fs-writeback.c:2057
wb_check_old_data_flush fs/fs-writeback.c:2157 [inline]
wb_do_writeback fs/fs-writeback.c:2210 [inline]
wb_workfn+0xbec/0x1020 fs/fs-writeback.c:2238
process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2289
worker_thread+0xa5f/0x1210 kernel/workqueue.c:2436
kthread+0x26e/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/12:
#0: ffffffff8cf273f0 (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: ffffffff8cf27bf0 (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: ffffffff8cf27220 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3301:
#0: ffff88814b4e8098 (&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 kworker/u4:70/6211:
4 locks held by kworker/u4:104/6512:
#0: ffff8880146fe938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0
#1: ffffc90016707d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2264
#2: ffff8880262c20e0 (&type->s_umount_key#56){.+.+}-{3:3}, at: trylock_super+0x1b/0xf0 fs/super.c:415
#3: ffff888025dc1140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2207 [inline]
#3: ffff888025dc1140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x4fb/0x6c0 fs/f2fs/segment.c:418
2 locks held by syz-executor.0/7737:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.27-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7737 Comm: syz-executor.0 Not tainted 6.1.27-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:gc_data_segment fs/f2fs/gc.c:1507 [inline]
RIP: 0010:do_garbage_collect+0x19c0/0x7940 fs/f2fs/gc.c:1740
Code: 0f b6 04 18 84 c0 0f 85 e0 26 00 00 48 8b 44 24 70 44 8b 38 bf 01 00 00 00 44 89 fe e8 09 68 c3 fd 48 8b 44 24 50 80 3c 18 00 <48> 8b 5c 24 38 74 08 48 89 df e8 a1 aa 19 fe 48 8b 1b 48 89 d8 48
RSP: 0018:ffffc900038edaa0 EFLAGS: 00000246
RAX: 1ffff11004bb802d RBX: dffffc0000000000 RCX: ffff88807e41d7c0
RDX: ffff88807e41d7c0 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc900038ee0d0 R08: ffffffff83c66417 R09: ffffc900038edfe0
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f38aab1
R13: 0000000000000040 R14: 1ffff1100f38aab0 R15: 0000000000000001
FS: 00007f96507f8700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ee5b15b90 CR3: 000000007c80a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
f2fs_gc+0xc73/0x22f0 fs/f2fs/gc.c:1838
f2fs_balance_fs+0x506/0x6c0 fs/f2fs/segment.c:419
f2fs_write_single_data_page+0x10c9/0x1f70 fs/f2fs/data.c:2885
f2fs_write_cache_pages fs/f2fs/data.c:3101 [inline]
__f2fs_write_data_pages fs/f2fs/data.c:3251 [inline]
f2fs_write_data_pages+0x1978/0x2e60 fs/f2fs/data.c:3278
do_writepages+0x3a2/0x670 mm/page-writeback.c:2469
filemap_fdatawrite_wbc+0x121/0x180 mm/filemap.c:388
__filemap_fdatawrite_range mm/filemap.c:421 [inline]
file_write_and_wait_range+0x1ca/0x2b0 mm/filemap.c:774
f2fs_do_sync_file+0x69d/0x1c00 fs/f2fs/file.c:275
generic_write_sync include/linux/fs.h:2897 [inline]
f2fs_file_write_iter+0x723/0x2990 fs/f2fs/file.c:4729
__kernel_write_iter+0x2ff/0x710 fs/read_write.c:517
dump_emit_page fs/coredump.c:881 [inline]
dump_user_range+0x43d/0x8e0 fs/coredump.c:908
elf_core_dump+0x3cff/0x45b0 fs/binfmt_elf.c:2312
do_coredump+0x18b7/0x2700 fs/coredump.c:755
get_signal+0x1454/0x17d0 kernel/signal.c:2844
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:310
exc_page_fault+0x4e0/0x790 arch/x86/mm/fault.c:1578
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000000020000188 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f964fbabf80 RCX: 00007f964fa8c169
RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000000
RBP: 00007f964fae7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7905faef R14: 00007f96507f8300 R15: 0000000000022000