INFO: task syz.3.6118:21606 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.6118 state:D stack:28424 pid:21606 tgid:21605 ppid:5606 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7607
rt_mutex_slowlock_block+0x55c/0x680 kernel/locking/rtmutex.c:1670
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:578
write_versions+0x95/0xe30 fs/nfsd/nfsctl.c:701
nfsctl_transaction_write+0x112/0x160 fs/nfsd/nfsctl.c:112
vfs_write+0x29f/0xbb0 fs/read_write.c:685
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3452cbde99
RSP: 002b:00007f3450f16028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3452f45fa0 RCX: 00007f3452cbde99
RDX: 0000000000000006 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007f3452d53eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3452f46038 R14: 00007f3452f45fa0 R15: 00007ffe80a6cc48
INFO: task syz.3.6118:21607 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.6118 state:D stack:28424 pid:21607 tgid:21605 ppid:5606 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7607
rt_mutex_slowlock_block+0x55c/0x680 kernel/locking/rtmutex.c:1670
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1787 [inline]
rt_mutex_slowlock+0x2d4/0x780 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:578
write_maxblksize+0x40f/0x630 fs/nfsd/nfsctl.c:908
nfsctl_transaction_write+0x112/0x160 fs/nfsd/nfsctl.c:112
vfs_write+0x29f/0xbb0 fs/read_write.c:685
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3452cbde99
RSP: 002b:00007f3450ef5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3452f46090 RCX: 00007f3452cbde99
RDX: 0000000000000006 RSI: 00002000000001c0 RDI: 0000000000000004
RBP: 00007f3452d53eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3452f46128 R14: 00007f3452f46090 R15: 00007ffe80a6cc48
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5356:
#0: ffff8880368c00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cbe2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5605:
#0: ffff888036f360d0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888036f360d0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888036f360d0 (&type->s_umount_key#69){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:509
#1: ffffffff8e4e9538 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x4e/0xd0 fs/nfsd/nfssvc.c:576
4 locks held by kworker/u8:45/14675:
#0: ffff88801aea0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88801aea0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc900059c7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc900059c7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f5a3240 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 net/core/net_namespace.c:673
#3: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_unregister+0xd1/0x300 net/rfkill/core.c:1161
3 locks held by kworker/1:1/17172:
#0: ffff88813ff1b938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88813ff1b938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90005cd7c40 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90005cd7c40 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_global_led_trigger_worker+0x27/0xd0 net/rfkill/core.c:185
2 locks held by syz.4.4733/18385:
#0: ffffffff8f6230a0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff8e4e9538 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x136/0x16e0 fs/nfsd/nfsctl.c:1964
3 locks held by syz.3.6118/21606:
#0: ffff88802bd0d728 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
#1: ffff888063d76500 (sb_writers#26){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2733 [inline]
#1: ffff888063d76500 (sb_writers#26){.+.+}-{0:0}, at: vfs_write+0x231/0xbb0 fs/read_write.c:683
#2: ffffffff8e4e9538 (nfsd_mutex){+.+.}-{4:4}, at: write_versions+0x95/0xe30 fs/nfsd/nfsctl.c:701
3 locks held by syz.3.6118/21607:
#0: ffff88802bd0c128 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1259
#1: ffff888063d76500 (sb_writers#26){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2733 [inline]
#1: ffff888063d76500 (sb_writers#26){.+.+}-{0:0}, at: vfs_write+0x231/0xbb0 fs/read_write.c:683
#2: ffffffff8e4e9538 (nfsd_mutex){+.+.}-{4:4}, at: write_maxblksize+0x40f/0x630 fs/nfsd/nfsctl.c:908
1 lock held by syz.8.6621/22982:
#0: ffff888036f360d0 (&type->s_umount_key#69){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff888036f360d0 (&type->s_umount_key#69){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz-executor/23180:
#0: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_unregister+0xd1/0x300 net/rfkill/core.c:1161
8 locks held by syz-executor/23639:
2 locks held by syz.5.6890/23933:
#0: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_write+0x199/0x570 net/rfkill/core.c:1308
#1: ffffffff8f5b1df8 (rtnl_mutex){+.+.}-{4:4}, at: cfg80211_rfkill_set_block+0x1e/0x50 net/wireless/core.c:393
2 locks held by syz-executor/24119:
#0: ffff88802636a188 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device+0x33/0x6f0 drivers/bluetooth/hci_vhci.c:488
#1: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x33/0x9d0 net/rfkill/core.c:1087
2 locks held by syz-executor/24133:
#0: ffff8880398be988 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device+0x33/0x6f0 drivers/bluetooth/hci_vhci.c:488
#1: ffffffff8f8c2818 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x33/0x9d0 net/rfkill/core.c:1087
4 locks held by sed/24148:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24148 Comm: sed Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:zap_present_folio_ptes mm/memory.c:1677 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1730 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1832 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1934 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:2020 [inline]
RIP: 0010:zap_pud_range mm/memory.c:2048 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:2069 [inline]
RIP: 0010:__zap_vma_range+0x2323/0x49e0 mm/memory.c:2109
Code: 24 58 8d 73 01 31 ff e8 cb f3 af ff ff c3 0f 88 0c 03 00 00 e8 0e ef af ff 48 8b 5c 24 40 41 0f b6 cc 48 8b bc 24 98 00 00 00 <48> 8b b4 24 f0 00 00 00 ba 01 00 00 00 e8 8b 1c 04 00 84 c0 0f 85
RSP: 0018:ffffc9000806f5e0 EFLAGS: 00000293
RAX: ffffffff8215dbe2 RBX: ffff88806eb5b630 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000806fac0
RBP: ffffc9000806f8d0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400008a4bf R12: 0000000000000000
R13: dffffc0000000000 R14: 00007f4654cd1000 R15: 00007f4654cc6000
FS: 0000000000000000(0000) GS:ffff888125c41000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe42d7ee368 CR3: 000000002b74a000 CR4: 00000000003526f0
Call Trace:
unmap_vmas+0x390/0x550 mm/memory.c:2178
exit_mmap+0x293/0x9f0 mm/mmap.c:1300
__mmput+0xcb/0x3d0 kernel/fork.c:1187
exit_mm+0x186/0x240 kernel/exit.c:615
do_exit+0x6cd/0x2360 kernel/exit.c:997
do_group_exit+0x22d/0x2f0 kernel/exit.c:1152
__do_sys_exit_group kernel/exit.c:1163 [inline]
__se_sys_exit_group kernel/exit.c:1161 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1161
x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4654ace6c5
Code: Unable to access opcode bytes at 0x7f4654ace69b.
RSP: 002b:00007ffe7e2bc298 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f4654bcffe8 RCX: 00007f4654ace6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4654bce680 R15: 00007f4654bd0000