INFO: task syz-executor:7042 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21288 pid:7042 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
wb_wait_for_completion+0x173/0x2a0 fs/fs-writeback.c:192
sync_inodes_sb+0x1c9/0xa10 fs/fs-writeback.c:2778
sync_filesystem+0x171/0x220 fs/sync.c:64
generic_shutdown_super+0x6f/0x2b0 fs/super.c:666
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x95a/0x2460 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
__do_sys_exit_group kernel/exit.c:1035 [inline]
__se_sys_exit_group kernel/exit.c:1033 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f61b8b9bf79
RSP: 002b:00007ffd613f53e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f61b8c31c9b RCX: 00007f61b8b9bf79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 000000000000000c R08: 0000000000000000 R09: 00007f61b8c31c3b
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd613f66a0
R13: 00007f61b8c31c3b R14: 00005555676f94e8 R15: 00007ffd613f7770
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d131fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131fa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
5 locks held by kworker/u4:6/1071:
#0: ffff888017c73938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017c73938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc900044cfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc900044cfd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#2: ffffffff8e3b31d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x14c/0xbb0 net/core/net_namespace.c:606
#3: ffff8880699cd250 (&devlink->lock_key#13){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:60 [inline]
#3: ffff8880699cd250 (&devlink->lock_key#13){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0xee/0x360 net/devlink/core.c:285
#4: ffffffff8d137840 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:4089
2 locks held by kworker/u4:7/1093:
#0: ffff88801a67e538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff88801a67e538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc9000458fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000458fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
2 locks held by getty/5527:
#0: ffff88814e1780a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
1 lock held by udevd/5781:
2 locks held by syz-executor/7042:
#0: ffff8880319820e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880319820e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880319820e0 (&type->s_umount_key#62){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffff888021d6a7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff888021d6a7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x1ad/0xa10 fs/fs-writeback.c:2776
1 lock held by syz.4.979/10461:
#0: ffff88805989e0e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: xfs_open_devices+0x3f0/0x420 fs/xfs/xfs_super.c:491
4 locks held by sed/10482:
4 locks held by modprobe/10487:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10487 Comm: modprobe Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:policy_node mm/mempolicy.c:1873 [inline]
RIP: 0010:vma_alloc_folio+0x2aa/0x8f0 mm/mempolicy.c:2241
Code: 00 e8 5a 74 ab ff 89 ef 89 de 44 89 f2 31 c9 e8 5c a7 f7 ff 49 89 c4 4d 85 ff 0f 85 d9 fe ff ff e8 3b 74 ab ff e9 0c 01 00 00 <4d> 8d 77 08 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80
RSP: 0000:ffffc9000520fa98 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9731fe44 RCX: 0000000000000003
RDX: ffffffff81db9ef9 RSI: ffffffff8d2260d0 RDI: 0000000000000001
RBP: ffff88807a36b400 R08: ffff888024808000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: 1ffffffff2e63fc8
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff9731fe40
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5973a9be8 CR3: 000000002c9f9000 CR4: 00000000003506e0
DR0: 0000000000000007 DR1: 0000000000000005 DR2: 0000000000000006
DR3: 0000000000007fff DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
wp_page_copy mm/memory.c:3094 [inline]
do_wp_page+0x1272/0x35f0 mm/memory.c:3469
handle_pte_fault mm/memory.c:5063 [inline]
__handle_mm_fault mm/memory.c:5188 [inline]
handle_mm_fault+0x135d/0x4c00 mm/memory.c:5353
do_user_addr_fault+0xac8/0x12c0 arch/x86/mm/fault.c:1322
handle_page_fault arch/x86/mm/fault.c:1463 [inline]
exc_page_fault+0x64/0x100 arch/x86/mm/fault.c:1516
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fe597656418
Code: fe ff ff 0f 1f 80 00 00 00 00 48 85 f6 0f 84 af 00 00 00 41 f6 85 56 03 00 00 20 0f 85 a1 00 00 00 49 8b 45 60 48 85 c0 74 04 <48> 01 70 08 49 8b 45 58 48 85 c0 74 04 48 01 70 08 49 8b 45 68 48
RSP: 002b:00007ffff0340880 EFLAGS: 00010202
RAX: 00007fe5973a9be0 RBX: 0000000000000030 RCX: 00007fe59764db60
RDX: 00007fe5973a9d30 RSI: 00007fe59739a000 RDI: 000000006fffffff
RBP: 00007ffff03409d0 R08: 0000000000000006 R09: 00000000effffef5
R10: 0000000070000029 R11: 00007ffff0340ab8 R12: 00007ffff0340730
R13: 00007fe59764db20 R14: 00007ffff0340a70 R15: 00007fe5973aa010