INFO: task syz.0.17:6490 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:26408 pid:6490 tgid:6490 ppid:6418 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7026
io_schedule+0x80/0xd0 kernel/sched/core.c:7871
folio_wait_bit_common+0x6b0/0xb80 mm/filemap.c:1335
folio_lock include/linux/pagemap.h:1149 [inline]
writeback_get_folio mm/page-writeback.c:2468 [inline]
writeback_iter+0x8d8/0x12a0 mm/page-writeback.c:2562
iomap_writepages+0x14d/0x2d0 fs/iomap/buffered-io.c:1769
gfs2_writepages+0x177/0x250 fs/gfs2/aops.c:175
do_writepages+0x32e/0x550 mm/page-writeback.c:2604
filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
__filemap_fdatawrite_range mm/filemap.c:422 [inline]
__filemap_fdatawrite mm/filemap.c:428 [inline]
filemap_fdatawrite+0x199/0x240 mm/filemap.c:433
gfs2_ordered_write fs/gfs2/log.c:729 [inline]
gfs2_log_flush+0x86b/0x24c0 fs/gfs2/log.c:1092
gfs2_trans_end+0x37c/0x570 fs/gfs2/trans.c:158
gfs2_page_mkwrite+0x14a8/0x1910 fs/gfs2/file.c:535
do_page_mkwrite+0x14d/0x310 mm/memory.c:3532
do_shared_fault mm/memory.c:5818 [inline]
do_fault mm/memory.c:5880 [inline]
do_pte_missing mm/memory.c:4405 [inline]
handle_pte_fault mm/memory.c:6221 [inline]
__handle_mm_fault+0x1911/0x5440 mm/memory.c:6363
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6532
do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f1cbc6550b3
RSP: 002b:00007ffd048e8a20 EFLAGS: 00010246
RAX: 0000200000000180 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005555754493c8
RBP: 00007ffd048e8b28 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007f1cbc9b5fac
R13: 00007f1cbc9b5fa0 R14: fffffffffffffffe R15: 00007ffd048e8b70
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e13d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:3/49:
#0: ffff88813fe69948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88813fe69948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc90000ba7ba0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc90000ba7ba0 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
4 locks held by kworker/u8:4/60:
#0: ffff888140a88948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff888140a88948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc9000211fba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000211fba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
#2: ffff888078c900e0 (&type->s_umount_key#53){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
#3: ffff88807adacea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xec/0x24c0 fs/gfs2/log.c:1035
2 locks held by getty/5591:
#0: ffff8880348290a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
4 locks held by syz.0.17/6490:
#0: ffff888075356308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1a3/0x450 mm/mmap_lock.c:238
#1: ffff888078c90518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3532
#2: ffff888078c90610 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118
#3: ffff88807adacea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xec/0x24c0 fs/gfs2/log.c:1035
1 lock held by gfs2_logd/syz:s/6496:
#0: ffff88807adacea0 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0xec/0x24c0 fs/gfs2/log.c:1035
3 locks held by syz.1.207/7289:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:337 [inline]
watchdog+0xfa9/0xff0 kernel/hung_task.c:500
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7289 Comm: syz.1.207 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:update_rq_clock_pelt kernel/sched/pelt.h:126 [inline]
RIP: 0010:update_rq_clock_task kernel/sched/core.c:828 [inline]
RIP: 0010:update_rq_clock+0x37d/0x5b0 kernel/sched/core.c:853
Code: 03 80 3c 28 00 74 08 4c 89 e7 e8 ce be 95 00 4d 0f af 3c 24 49 c1 ff 0a 48 81 c3 48 0b 00 00 48 89 d8 48 c1 e8 03 80 3c 28 00 <74> 08 48 89 df e8 a9 be 95 00 4c 01 3b 48 83 c4 10 5b 41 5c 41 5d
RSP: 0018:ffffc90000a08ad8 EFLAGS: 00000046
RAX: 1ffff110170e7571 RBX: ffff8880b873ab88 RCX: ffff8880342a3c80
RDX: 0000000000000100 RSI: ffffffff8bc07cc0 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8f9e3177 R09: 1ffffffff1f3c62e
R10: dffffc0000000000 R11: fffffbfff1f3c62f R12: ffff8880b8723008
R13: 0000000000000000 R14: ffffffff8da10dd8 R15: 0000000000000000
FS: 00007f7c574566c0(0000) GS:ffff888125e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c4e5ff000 CR3: 0000000072ba6000 CR4: 00000000003526f0
Call Trace:
ttwu_queue kernel/sched/core.c:3968 [inline]
try_to_wake_up+0x70d/0x12b0 kernel/sched/core.c:4293
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2034 [inline]
RIP: 0010:vprintk_emit+0x49d/0x590 kernel/printk/printk.c:2422
Code: 0f 84 34 ff ff ff e8 92 ee 1f 00 fb eb 44 e8 8a ee 1f 00 e8 e5 13 ae 09 4d 85 f6 74 94 e8 7b ee 1f 00 fb 48 c7 c7 c0 12 13 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 1b 3b
RSP: 0018:ffffc9000b706d80 EFLAGS: 00000293
RAX: ffffffff81a06e35 RBX: ffffffff81a06c8e RCX: ffff8880342a3c80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1312c0
RBP: ffffc9000b706e90 R08: ffffffff8f9e3177 R09: 1ffffffff1f3c62e
R10: dffffc0000000000 R11: fffffbfff1f3c62f R12: 0000000000000000
R13: 000000000000002f R14: 0000000000000200 R15: 1ffff920016e0db4
_printk+0xcf/0x120 kernel/printk/printk.c:2448
set_capacity_and_notify+0x208/0x2d0 block/genhd.c:93
loop_set_size+0x44/0xb0 drivers/block/loop.c:220
loop_configure+0x9f8/0xe50 drivers/block/loop.c:1081
lo_ioctl+0x806/0x1c50 drivers/block/loop.c:-1
blkdev_ioctl+0x5af/0x6d0 block/ioctl.c:705
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c5658e7eb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007f7c57455dc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f7c5658e7eb
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001f78a
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f7c57455ef0 R14: 00007f7c57455eb0 R15: 00007f7c4d600000