INFO: task syz-executor:5605 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22432 pid:5605 tgid:5605 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7376
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xccb/0x1bd0 kernel/locking/mutex.c:821
nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:582
nfsd_umount+0x3b/0x60 fs/nfsd/nfsctl.c:1372
deactivate_locked_super+0xbd/0x130 fs/super.c:586
deactivate_super fs/super.c:614 [inline]
deactivate_super+0xea/0x110 fs/super.c:610
cleanup_mnt+0x21f/0x450 fs/namespace.c:1317
task_work_run+0x150/0x240 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x1d8/0x700 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7a20f9f397
RSP: 002b:00007ffc1f41f4a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7a210344bb RCX: 00007f7a20f9f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc1f41f560
RBP: 00007ffc1f41f560 R08: 00007ffc1f420560 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1f4205f0
R13: 00007f7a210344bb R14: 00000000000ce1c8 R15: 00007ffc1f420630
Showing all locks held in the system:
locks held by khungtaskd/31: 1, last CPU#0:
#0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by syz-executor/5604: 2, on CPU#1:
#0: ffff88804c1120e8 (&type->s_umount_key#87){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88804c1120e8 (&type->s_umount_key#87){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
#0: ffff88804c1120e8 (&type->s_umount_key#87){++++}-{4:4}, at: deactivate_super fs/super.c:613 [inline]
#0: ffff88804c1120e8 (&type->s_umount_key#87){++++}-{4:4}, at: deactivate_super+0xe2/0x110 fs/super.c:610
#1: ffffffff8f289bc0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:582
locks held by syz-executor/5605: 2, on CPU#1:
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: deactivate_super fs/super.c:613 [inline]
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: deactivate_super+0xe2/0x110 fs/super.c:610
#1: ffffffff8f289bc0 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:582
locks held by kworker/u8:10/5816: 2, on CPU#1:
#0: ffff88801c094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
#1: ffffc9000496fd08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by syz.0.2565/13411: 3, on CPU#0:
#0: ffff888079c72d30 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2aa/0x380 fs/file.c:1259
#1: ffff88807f988460 (sb_writers#20){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
#2: ffffffff8f289bc0 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xa5/0xcc0 fs/nfsd/nfsctl.c:867
locks held by getty/14385: 2, on CPU#1:
#0: ffff888037b740a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002eac2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by syz.5.3472/16168: 1, on CPU#1:
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: __super_lock fs/super.c:62 [inline]
#0: ffff8880359aa0e8 (&type->s_umount_key#87){++++}-{4:4}, at: super_lock+0x326/0x3f0 fs/super.c:124
locks held by syz.8.4114/18246: 1, on CPU#0:
#0: ffffffff8edf8378 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3904
locks held by syz.4.4115/18251: 2, last CPU#1:
#0: ffff888034151bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
#0: ffff888034151bc0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x124/0xa00 mm/mmap.c:1299
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290
locks held by modprobe/18255: 2, last CPU#1:
#0: ffff88801c084080 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff88801c084080 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
#1: ffff88807139e490 (&anon_vma->rwsem){++++}-{4:4}, at: anon_vma_lock_read mm/internal.h:310 [inline]
#1: ffff88807139e490 (&anon_vma->rwsem){++++}-{4:4}, at: validate_mm+0x1f1/0x4e0 mm/vma.c:724
locks held by syz.7.4117/18256: 2, last CPU#1:
#0: ffff888039330088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
#1: ffffffff8edec5a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 18255 Comm: modprobe Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:write_comp_data+0x8/0xa0 kernel/kcov.c:236
Code: 24 08 e8 6b 85 73 00 e9 6d fd ff ff 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 90 df 80 12 <49> 89 f8 49 89 d2 49 89 f1 65 48 8b 3d 6f df 80 12 48 63 d0 a9 00
RSP: 0018:ffffc9000378f360 EFLAGS: 00000206
RAX: 8000000000000000 RBX: 0000000000000005 RCX: ffffffff8bcb38f2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000005
RBP: ffffffff8d72a6e0 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000005 R14: 0000000000000005 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888123c4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e86f95a10 CR3: 000000007e4b8000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:347
ma_slots lib/maple_tree.c:646 [inline]
mas_next_slot+0x392/0x13a0 lib/maple_tree.c:4264
mas_next_range lib/maple_tree.c:5203 [inline]
mas_next_range+0xed/0x100 lib/maple_tree.c:5194
vma_iter_next_range include/linux/mm.h:1682 [inline]
vma_iter_next_rewind mm/vma.h:750 [inline]
__mmap_setup mm/vma.c:2556 [inline]
__mmap_region+0xd7c/0x32e0 mm/vma.c:2869
mmap_region+0x3db/0x6d0 mm/vma.c:2974
do_mmap+0x12c7/0x1c30 mm/mmap.c:573
vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:89
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e872c2242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffc2d3135e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e872c2242
RDX: 0000000000000001 RSI: 0000000000061018 RDI: 0000000000000000
RBP: 0000000000000802 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e86f996b0 R14: 00007ffc2d313a20 R15: 00000fff85a626c0