INFO: task syz.4.1001:3477 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1001      state:D stack:0     pid:3477  tgid:3476  ppid:1025   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 request_wait_answer fs/fuse/dev.c:476 [inline]
 __fuse_request_send fs/fuse/dev.c:491 [inline]
 __fuse_simple_request+0xdb1/0x1980 fs/fuse/dev.c:586
 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
 fuse_send_open fs/fuse/file.c:53 [inline]
 fuse_file_open+0x47c/0x910 fs/fuse/file.c:161
 fuse_do_open fs/fuse/file.c:190 [inline]
 fuse_open+0x83d/0x1ba0 fs/fuse/file.c:293
 do_dentry_open+0x978/0x1510 fs/open.c:960
 vfs_open+0x86/0x230 fs/open.c:1090
 do_open fs/namei.c:3774 [inline]
 path_openat+0x2b6c/0x34b0 fs/namei.c:3933
 do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
 do_sys_open fs/open.c:1453 [inline]
 __do_sys_openat fs/open.c:1469 [inline]
 __se_sys_openat fs/open.c:1464 [inline]
 __x64_sys_openat+0x13a/0x170 fs/open.c:1464
 x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f046e58eba9
RSP: 002b:00007f046f3c5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f046e7d5fa0 RCX: 00007f046e58eba9
RDX: 0000000000080101 RSI: 000020000000c380 RDI: ffffffffffffff9c
RBP: 00007f046e611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f046e7d6038 R14: 00007f046e7d5fa0 R15: 00007ffefc2ae0e8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 999ed7ff739122807d950cd03a17deb2b8fbe7d9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7939 Comm: syz.9.2462 Not tainted syzkaller #0 999ed7ff739122807d950cd03a17deb2b8fbe7d9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 70 05 48 89 de e8 00 29 52 00 5b 5d c3 cc cc cc cc cc cc cc cc cc cc cc cc cc b8 6d 87 37 f1 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 48 8b 45 08 65 48 8b 0c 25 80 eb 04 00 65
RSP: 0018:ffffc9000389f518 EFLAGS: 00000202
RAX: ffffffff81cc4a4a RBX: 1ffffd400096b23b RCX: 0000000000000000
RDX: ffff88812aae9300 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000389f750 R08: ffffea0004b591c7 R09: 1ffffd400096b238
R10: dffffc0000000000 R11: fffff9400096b239 R12: 0000000000000001
R13: ffff888116a06fc0 R14: ffffea0004b591d8 R15: 00007f4b8edf8000
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc9bef4f8c CR3: 000000012b7c6000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 unmap_single_vma mm/memory.c:1880 [inline]
 unmap_vmas+0x2c5/0x3e0 mm/memory.c:1924
 exit_mmap+0x25b/0xb60 mm/mmap.c:1962
 __mmput+0x93/0x320 kernel/fork.c:1349
 mmput+0x55/0x170 kernel/fork.c:1372
 exit_mm kernel/exit.c:574 [inline]
 do_exit+0x918/0x2630 kernel/exit.c:940
 do_group_exit+0x22a/0x300 kernel/exit.c:1095
 get_signal+0x139d/0x14f0 kernel/signal.c:2933
 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x4e/0xb0 kernel/entry/common.c:231
 irqentry_exit+0x16/0x60 kernel/entry/common.c:334
 exc_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f4b8fb8eba9
Code: Unable to access opcode bytes at 0x7f4b8fb8eb7f.
RSP: 002b:00007f4b8e5f6fe8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f4b8fdd6090 RCX: 00007f4b8fb8eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f4b8fc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4b8fdd6128 R14: 00007f4b8fdd6090 R15: 00007ffda9b6bbd8
 </TASK>