INFO: task syz.0.7610:4451 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.7610 state:D stack:27640 pid:4451 tgid:4448 ppid:30081 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7322
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7bf/0x1550 kernel/locking/mutex.c:821
nfsd_nl_version_set_doit+0xcd/0x7a0 fs/nfsd/nfsctl.c:1798
genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec net/socket.c:775 [inline]
__sock_sendmsg net/socket.c:790 [inline]
____sys_sendmsg+0x9b9/0xa20 net/socket.c:2684
___sys_sendmsg+0x2a5/0x360 net/socket.c:2738
__sys_sendmsg net/socket.c:2770 [inline]
__do_sys_sendmsg net/socket.c:2775 [inline]
__se_sys_sendmsg net/socket.c:2773 [inline]
__x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2773
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: 0033:0x7fe75d79ce59
RSP: 002b:00007fe75e6ec028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fe75da15fa0 RCX: 00007fe75d79ce59
RDX: 0000000004008090 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007fe75d832e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe75da16038 R14: 00007fe75da15fa0 R15: 00007ffc4961d2d8
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
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: 10377 Comm: syz.8.9117 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:208
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 c0 a6 35 0a cc 89 f6 31 d2 e9 86 8e 7a 03 66 0f 1f 44 00
RSP: 0018:ffffc90000007d10 EFLAGS: 00000046
RAX: 0000000000000281 RBX: ffff8880b8623c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 0000000000000281 RDI: 0000000000000838
RBP: ffffc90000007de0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: ffffffff8173f530 R12: 0000000000000281
R13: dffffc0000000000 R14: 000000001000035a R15: 0000000000000020
FS: 0000000000000000(0000) GS:ffff88812527c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3337ec4b8 CR3: 0000000025fa0000 CR4: 00000000003526f0
Call Trace:
apic_write arch/x86/include/asm/apic.h:405 [inline]
lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418
clockevents_program_event+0x385/0x630 kernel/time/clockevents.c:372
hrtimer_rearm kernel/time/hrtimer.c:2141 [inline]
__hrtimer_rearm_deferred+0x26c/0x420 kernel/time/hrtimer.c:2161
hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:53 [inline]
hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:62 [inline]
irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:505 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
irqentry_exit+0x8b7/0x8f0 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:312 [inline]
RIP: 0010:handle_softirqs+0x15b/0x840 kernel/softirq.c:610
Code: 89 6c 24 20 0f b7 db 48 c7 c7 20 20 cb 8b e8 8c 51 20 0a 65 66 c7 05 aa ae b2 11 00 00 e8 5d 91 46 00 fb 48 c7 c5 c0 a0 60 8e ff ff ff ff 0f bc c3 41 89 c4 41 ff c4 0f 84 09 04 00 00 89 5c
RSP: 0018:ffffc90000007f30 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000004 RCX: 0000000080000102
RDX: 0000000000000000 RSI: ffffffff8c291100 RDI: ffffffff81879193
RBP: ffffffff8e60a0c0 R08: ffffffff903116f7 R09: 1ffffffff20622de
R10: dffffc0000000000 R11: fffffbfff20622df R12: 0000000000000000
R13: 0000000000000000 R14: ffff88802e3f5d00 R15: dffffc0000000000
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:zap_present_folio_ptes mm/memory.c:1647 [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+0x1744/0x4c70 mm/memory.c:2109
Code: 8b 8c 24 b0 00 00 00 0f b6 04 01 84 c0 48 8b 54 24 20 0f 85 30 1b 00 00 44 0f b7 2a 41 83 e5 01 31 ff 44 89 ee e8 9c 4b af ff <4d> 85 e4 75 39 66 45 85 ed 4c 89 bc 24 c0 00 00 00 75 5c 4c 89 f7
RSP: 0018:ffffc90005d873a0 EFLAGS: 00000293
RAX: ffffffff8216ae24 RBX: 1ffffd4000b1e6c3 RCX: 0000000000000000
RDX: ffff88802e3f5d00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90005d87690 R08: ffffea00058f3607 R09: 1ffffd4000b1e6c0
R10: dffffc0000000000 R11: fffff94000b1e6c1 R12: 0000000000000000
R13: 0000000000000001 R14: ffff8880687bc6b8 R15: 00007f279c2d7000
unmap_vmas+0x390/0x550 mm/memory.c:2178
exit_mmap+0x293/0x9f0 mm/mmap.c:1300
__mmput+0x118/0x420 kernel/fork.c:1181
exit_mm+0x221/0x2d0 kernel/exit.c:610
do_exit+0x6cd/0x2360 kernel/exit.c:992
do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
get_signal+0x121b/0x12c0 kernel/signal.c:3038
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x104/0x730 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:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f279c79ce59
Code: Unable to access opcode bytes at 0x7f279c79ce2f.
RSP: 002b:00007f279d66e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000000001 RBX: 00007f279ca15fa0 RCX: 00007f279c79ce59
RDX: 0000000000000002 RSI: 0000200000007980 RDI: 0000000000000005
RBP: 00007f279c832e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000002181 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f279ca16038 R14: 00007f279ca15fa0 R15: 00007fff539b8fd8