INFO: task syz.0.402:7498 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.402 state:D stack:25760 pid:7498 tgid:7498 ppid:5843 task_flags:0x40004c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x1665/0x5590 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7119
rwsem_down_read_slowpath+0x6d9/0x940 kernel/locking/rwsem.c:1114
__down_read_common kernel/locking/rwsem.c:1291 [inline]
__down_read kernel/locking/rwsem.c:1304 [inline]
down_read+0x99/0x2e0 kernel/locking/rwsem.c:1570
mmap_read_lock include/linux/mmap_lock.h:592 [inline]
exit_mm+0x73/0x250 kernel/exit.c:557
do_exit+0x8b9/0x2490 kernel/exit.c:962
do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
__do_sys_exit_group kernel/exit.c:1127 [inline]
__se_sys_exit_group kernel/exit.c:1125 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1125
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb50fd9c799
RSP: 002b:00007ffede6d82f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007fb50fd9c799
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000000000000000b
RBP: 00000000000000f7 R08: 00007ffede6d87a7 R09: 000000000000000b
R10: 00007fb510015fa0 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fb51001627c R14: 00007fb510016278 R15: 00007fb510016270
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8eb5d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8eb5d6a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8eb5d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5606:
#0: ffff8880329fc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz.0.402/7498:
#0: ffff88807d27dab8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:592 [inline]
#0: ffff88807d27dab8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mm+0x73/0x250 kernel/exit.c:557
=============================================
NMI backtrace for cpu 1
CPU: 1 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 02/12/2026
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+0x1002/0x1060 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 5831 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:account_numa_dequeue kernel/sched/fair.c:1727 [inline]
RIP: 0010:account_entity_dequeue kernel/sched/fair.c:3841 [inline]
RIP: 0010:dequeue_entity kernel/sched/fair.c:5629 [inline]
RIP: 0010:dequeue_entities+0x8a3/0x3820 kernel/sched/fair.c:7281
Code: 20 84 c0 0f 85 52 08 00 00 41 8b 3e e8 b6 02 e2 ff 45 31 f6 39 c5 40 0f 94 c5 48 83 c3 08 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 47 08 00 00 41 88 ee 41 f7 de 44 01 33 49 8d 5f 48 48
RSP: 0018:ffffc900038e7838 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff8880b843ad88 RCX: ffff88807d165b80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000001 R08: ffffffff905444f7 R09: 1ffffffff20a889e
R10: dffffc0000000000 R11: fffffbfff20a889f R12: dffffc0000000000
R13: ffff8880b843ae40 R14: 0000000000000000 R15: ffff88807d165c00
FS: 0000555566101540(0000) GS:ffff888124de1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fddfc7e92f8 CR3: 0000000075334000 CR4: 00000000003526f0
Call Trace:
dequeue_task_fair+0x200/0x670 kernel/sched/fair.c:7377
block_task kernel/sched/core.c:2223 [inline]
try_to_block_task kernel/sched/core.c:6587 [inline]
__schedule+0x6da/0x5590 kernel/sched/core.c:6899
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
do_nanosleep+0x1c2/0x620 kernel/time/hrtimer.c:2292
hrtimer_nanosleep+0x18f/0x3a0 kernel/time/hrtimer.c:2338
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1391 [inline]
__se_sys_clock_nanosleep+0x35b/0x3b0 kernel/time/posix-timers.c:1368
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f71f1d57917
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd9e495020 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000555566101540 RCX: 00007f71f1d57917
RDX: 00007ffd9e495060 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd9e495540 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007ffd9e49509c R14: 00007ffd9e495130 R15: 0000000000000000