INFO: task syz.3.673:9334 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.673 state:D stack:24408 pid:9334 tgid:9333 ppid:5829 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6864
__schedule_loop kernel/sched/core.c:6946 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6961
percpu_rwsem_wait+0x2e3/0x330 kernel/locking/percpu-rwsem.c:164
__percpu_down_read+0xf0/0x130 kernel/locking/percpu-rwsem.c:180
percpu_down_read_internal include/linux/percpu-rwsem.h:67 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs/super.h:19 [inline]
sb_start_write+0x18e/0x1c0 include/linux/fs/super.h:125
mnt_want_write+0x41/0x90 fs/namespace.c:509
filename_create+0x14f/0x360 fs/namei.c:4872
do_mkdirat+0xca/0x4b0 fs/namei.c:5156
__do_sys_mkdirat fs/namei.c:5186 [inline]
__se_sys_mkdirat fs/namei.c:5184 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f170d58f749
RSP: 002b:00007f170b7f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f170d7e5fa0 RCX: 00007f170d58f749
RDX: 00000000000001c0 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f170d613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f170d7e6038 R14: 00007f170d7e5fa0 R15: 00007ffe26a2e018
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5582:
#0: ffff8880308a40a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5814:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:647
1 lock held by udevd/8055:
1 lock held by syz.3.673/9334:
#0: ffff88801ab26420 (sb_writers#32){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:509
3 locks held by kworker/1:10/11722:
#0: ffff88813fe55948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3236
#1: ffffc90004dcfb80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3237
#2: ffffffff8df47538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#2: ffffffff8df47538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:956
2 locks held by syz.8.1161/11947:
3 locks held by syz.2.1163/11952:
1 lock held by syz.9.1165/11958:
#0: ffffffff8df47400 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3816
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [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:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11947 Comm: syz.8.1161 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
RIP: 0010:folio_mapcount include/linux/mm.h:1399 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1652 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1708 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1810 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1854 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1946 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1975 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1996 [inline]
RIP: 0010:unmap_page_range+0x1ea6/0x4170 mm/memory.c:2017
Code: 1a 00 4d 8b 75 00 4c 89 f6 48 83 e6 40 31 ff e8 b0 71 b4 ff 49 83 e6 40 0f 85 46 07 00 00 49 83 c5 30 4c 89 ef be 04 00 00 00 b5 bb 1a 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 26
RSP: 0018:ffffc9000c3a73a0 EFLAGS: 00000282
RAX: ffffffff820d4660 RBX: 8000000067cae007 RCX: ffff88802c2c8000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea00019f2bb0
RBP: ffffc9000c3a7630 R08: ffffea00019f2b87 R09: 1ffffd400033e570
R10: dffffc0000000000 R11: fffff9400033e571 R12: dffffc0000000000
R13: ffffea00019f2bb0 R14: 0000000000000000 R15: 1ffff1100f0ebc00
FS: 0000000000000000(0000) GS:ffff888125f4f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 0000000033d3c000 CR4: 00000000003526f0
Call Trace:
unmap_single_vma mm/memory.c:2059 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:2101
exit_mmap+0x239/0xb10 mm/mmap.c:1277
__mmput+0x118/0x430 kernel/fork.c:1173
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x658/0x2310 kernel/exit.c:959
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f653b78e1ff
Code: Unable to access opcode bytes at 0x7f653b78e1d5.
RSP: 002b:00007f653c6a7df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000103000 RBX: 0000000000200000 RCX: 00007f653b78e1ff
RDX: 0000000000200000 RSI: 00007f6531400000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001f84d
R10: 0000200000033242 R11: 0000000000000293 R12: 0000000000000005
R13: 00007f653c6a7ef0 R14: 00007f653c6a7eb0 R15: 00007f6531400000