INFO: task syz.0.17:6549 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:26152 pid:6549 tgid:6549 ppid:6476 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:1330
folio_lock include/linux/pagemap.h:1141 [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:733 [inline]
gfs2_log_flush+0x966/0x24c0 fs/gfs2/log.c:1102
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:3488
do_shared_fault mm/memory.c:5774 [inline]
do_fault mm/memory.c:5836 [inline]
do_pte_missing mm/memory.c:4361 [inline]
handle_pte_fault mm/memory.c:6177 [inline]
__handle_mm_fault+0x1916/0x5400 mm/memory.c:6318
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6487
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: 0033:0x7fea302550b3
RSP: 002b:00007ffe2c8864e0 EFLAGS: 00010246
RAX: 0000200000000180 RBX: 0000000000000008 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055557a43d3c8
RBP: 00007ffe2c8865e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007fea305b5fac
R13: 00007fea305b5fa0 R14: fffffffffffffffe R15: 00007ffe2c886630
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8dd3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8dd3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8dd3d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:6/1163:
#0: ffff88801fe9b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88801fe9b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc90004027ba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc90004027ba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
#2: ffff8880274420e0 (&type->s_umount_key#53){.+.+}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
#3: ffff88802f064e50 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0x103/0x24c0 fs/gfs2/log.c:1045
5 locks held by kworker/u8:7/4806:
2 locks held by getty/5600:
#0: ffff88814cbf70a0 (&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.0.17/6549:
#0: ffff88804c33e588 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1a3/0x450 mm/mmap_lock.c:238
#1: ffff888027442518 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x14d/0x310 mm/memory.c:3488
#2: ffff888027442610 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118
#3: ffff88802f064e50 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0x103/0x24c0 fs/gfs2/log.c:1045
1 lock held by gfs2_logd/syz:s/6571:
#0: ffff88802f064e50 (&sdp->sd_log_flush_lock){++++}-{4:4}, at: gfs2_log_flush+0x103/0x24c0 fs/gfs2/log.c:1045
1 lock held by udevd/6584:
#0: ffff8880b873a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:638
2 locks held by syz.1.208/7374:
=============================================
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 08/18/2025
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:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
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: 7374 Comm: syz.1.208 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:const_folio_flags include/linux/page-flags.h:351 [inline]
RIP: 0010:folio_test_reclaim include/linux/page-flags.h:602 [inline]
RIP: 0010:folio_mark_dirty+0x45/0x190 mm/page-writeback.c:2823
Code: d3 08 00 48 85 c0 0f 84 1f 01 00 00 49 89 c6 49 bc 00 00 00 00 00 fc ff df 4c 8d 7b 08 4d 89 fd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 ff e8 11 a8 2a 00 49 8b 2f 48 89 ee 48 83 e6 01 31 ff
RSP: 0018:ffffc90004757a90 EFLAGS: 00000246
RAX: ffff888030ab9090 RBX: ffffea0001d0d000 RCX: ffff888079789e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffea0001d0d007 R09: 1ffffd40003a1a00
R10: dffffc0000000000 R11: fffff940003a1a01 R12: dffffc0000000000
R13: 1ffffd40003a1a01 R14: ffff888030ab9090 R15: ffffea0001d0d008
FS: 00007f716e1186c0(0000) GS:ffff88812626c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f71653ff000 CR3: 0000000032da2000 CR4: 00000000003526f0
Call Trace:
shmem_write_end+0x424/0x5d0 mm/shmem.c:3321
generic_perform_write+0x62a/0x900 mm/filemap.c:4263
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3464
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
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: 0033:0x7f716d38d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f716e117df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f716d38d69f
RDX: 0000000001000000 RSI: 00007f7164400000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001f78a
R10: 000020000005e5c2 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f716e117ef0 R14: 00007f716e117eb0 R15: 00007f7164400000