INFO: task kworker/1:2:2896 blocked for more than 143 seconds.
Not tainted 6.8.0-rc3-next-20240209-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2 state:D stack:22888 pid:2896 tgid:2896 ppid:2 flags:0x00004000
Workqueue: xfs-sync/loop4 xfs_flush_inodes_worker
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17df/0x4a40 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6804 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6819
wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:217
sync_inodes_sb+0x293/0xb20 fs/fs-writeback.c:2783
xfs_flush_inodes_worker+0x61/0x80 fs/xfs/xfs_super.c:616
process_one_work kernel/workqueue.c:3143 [inline]
process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3223
worker_thread+0x86d/0xd70 kernel/workqueue.c:3304
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
INFO: task syz-executor.4:13872 blocked for more than 144 seconds.
Not tainted 6.8.0-rc3-next-20240209-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:22224 pid:13872 tgid:13872 ppid:5099 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17df/0x4a40 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6804 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6819
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
__flush_work+0xa7b/0xc90 kernel/workqueue.c:4015
xfs_file_buffered_write+0x35b/0xaa0 fs/xfs/xfs_file.c:808
__kernel_write_iter+0x435/0x8c0 fs/read_write.c:523
dump_emit_page fs/coredump.c:888 [inline]
dump_user_range+0x46d/0x910 fs/coredump.c:915
elf_core_dump+0x3d5e/0x4630 fs/binfmt_elf.c:2077
do_coredump+0x1bab/0x2b50 fs/coredump.c:764
get_signal+0x146b/0x1850 kernel/signal.c:2889
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
irqentry_exit_to_user_mode+0x79/0x280 kernel/entry/common.c:225
exc_page_fault+0x585/0x890 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x0
RSP: 002b:0000000020000328 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f11183abf80 RCX: 00007f111827dda9
RDX: 0000000020000040 RSI: 0000000020000320 RDI: 0000000020020000
RBP: 00007f11182ca47a R08: 0000000020000380 R09: 0000000020000380
R10: 0000000020000280 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f11183abf80 R15: 00007fff730674e8
Showing all locks held in the system:
4 locks held by kworker/u8:0/10:
#0: ffff88801aeae148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3118 [inline]
#0: ffff88801aeae148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3223
#1: ffffc900000f7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3118 [inline]
#1: ffffc900000f7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3223
#2: ffff88807ad90610 (sb_internal#3){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x267/0x1320 fs/xfs/libxfs/xfs_bmap.c:4542
#3: ffff888079eeaf98 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x295/0x1320 fs/xfs/libxfs/xfs_bmap.c:4547
1 lock held by khungtaskd/29:
#0: ffffffff8e1314e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e1314e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e1314e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
6 locks held by kworker/1:1/44:
4 locks held by kworker/1:2/2896:
#0: ffff88801e4cb948 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3118 [inline]
#0: ffff88801e4cb948 ((wq_completion)xfs-sync/loop4){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3223
#1: ffffc90009ec7d00 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3118 [inline]
#1: ffffc90009ec7d00 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3223
#2: ffff88807ad900e0 (&type->s_umount_key#60){++++}-{3:3}, at: xfs_flush_inodes_worker+0x45/0x80 fs/xfs/xfs_super.c:615
#3: ffff8880204027d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:389 [inline]
#3: ffff8880204027d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x274/0xb20 fs/fs-writeback.c:2781
2 locks held by getty/4826:
#0: ffff88802a3020a0 (&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.4/13872:
#0: ffff88807ad90420 (sb_writers#20){.+.+}-{0:0}, at: do_coredump+0x1b79/0x2b50 fs/coredump.c:763
#1: ffff888079eeb1b8
(&sb->s_type->i_mutex_key
#25){+.+.}-{3:3}, at: xfs_ilock+0xf2/0x3b0 fs/xfs/xfs_inode.c:190
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc3-next-20240209-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 44 Comm: kworker/1:1 Not tainted 6.8.0-rc3-next-20240209-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: xfs-buf/loop4 xfs_buf_ioend_work
RIP: 0010:io_serial_in+0x76/0xb0 drivers/tty/serial/8250/8250_port.c:410
Code: 70 33 64 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 a1 62 c7 fc 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c
RSP: 0018:ffffc90000b471b8 EFLAGS: 00000002
RAX: 1ffffffff28fb200 RBX: ffffffff947d91c0 RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff852fa7e6 R09: 1ffff11003f0e046
R10: dffffc0000000000 R11: ffffffff852fa7a0 R12: dffffc0000000000
R13: 00000000000026fc R14: 00000000000003fd R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556bf2978 CR3: 000000000df32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:117 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:139 [inline]
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2081 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3373 [inline]
serial8250_console_write+0x1173/0x18c0 drivers/tty/serial/8250/8250_port.c:3451
console_emit_next_record kernel/printk/printk.c:2907 [inline]
console_flush_all+0x865/0xfd0 kernel/printk/printk.c:2973
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3042
vprintk_emit+0x5a6/0x770 kernel/printk/printk.c:2342
_printk+0xd5/0x120 kernel/printk/printk.c:2367
print_hex_dump+0x1a6/0x250 lib/hexdump.c:285
xfs_hex_dump+0x3d/0x50 fs/xfs/xfs_message.c:110
xfs_buf_verifier_error+0x1ce/0x2a0 fs/xfs/xfs_error.c:460
xfs_agf_read_verify+0x200/0x2b0 fs/xfs/libxfs/xfs_alloc.c:3213
xfs_buf_ioend+0x278/0x700 fs/xfs/xfs_buf.c:1309
process_one_work kernel/workqueue.c:3143 [inline]
process_scheduled_works+0x9d7/0x1730 kernel/workqueue.c:3223
worker_thread+0x86d/0xd70 kernel/workqueue.c:3304
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242