INFO: task syz-executor529:313 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor529 state:D stack:0     pid:313   tgid:313   ppid:312    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6063 [inline]
 __schedule+0x16fe/0x23d0 kernel/sched/core.c:7883
 __schedule_loop kernel/sched/core.c:7960 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7975
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8032
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 device_lock include/linux/device.h:911 [inline]
 usb_device_read+0x176/0x2d0 drivers/usb/core/devices.c:528
 full_proxy_read+0x128/0x1e0 fs/debugfs/file.c:323
 vfs_read+0x28b/0xc70 fs/read_write.c:568
 ksys_read+0x145/0x260 fs/read_write.c:713
 __do_sys_read fs/read_write.c:723 [inline]
 __se_sys_read fs/read_write.c:721 [inline]
 __x64_sys_read+0x7f/0x90 fs/read_write.c:721
 x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f159752a009
RSP: 002b:00007ffca1233878 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0067756265642f2e RCX: 00007f159752a009
RDX: 0000000000002020 RSI: 00002000000010c0 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000006
R10: 0000000000000006 R11: 0000000000000246 R12: 00007ffca12339e8
R13: 431bde82d7b634db R14: 00007f15975bdc40 R15: 0000000000000002
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 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: 92 Comm: syslogd Not tainted syzkaller #0 bcd0852b9269e5a174a9e289c8567167f3c3d1d7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__kasan_check_write+0x5/0x20 mm/kasan/shadow.c:36
Code: 8b 4d 08 31 d2 e8 bb e4 ff ff 5d c3 cc cc cc cc cc 0f 1f 40 00 b8 98 19 26 dd 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 89 f6 48 8b 4d 08 ba 01 00 00 00 e8 88 e4 ff ff 5d e9 82
RSP: 0018:ffffc90000dcf778 EFLAGS: 00000297
RAX: ffffffff847ccf00 RBX: ffff88810b778b7c RCX: ffff88810cbba780
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88810b778b7c
RBP: ffffc90000dcf7d0 R08: ffff88810b778a67 R09: 1ffff110216ef14c
R10: dffffc0000000000 R11: ffffed10216ef14d R12: 0000000000000300
R13: 00000000000002ff R14: 1ffff110216ef14c R15: 0000000000000000
FS:  00007f0777676c80(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557a850398 CR3: 000000010cb7a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 unix_wfree+0x163/0x1b0 net/unix/af_unix.c:1900
 skb_release_head_state+0x115/0x260 net/core/skbuff.c:1177
 skb_release_all net/core/skbuff.c:1188 [inline]
 __kfree_skb+0x29/0x210 net/core/skbuff.c:1204
 consume_skb+0x65/0x1a0 net/core/skbuff.c:1436
 skb_free_datagram+0x19/0x30 net/core/datagram.c:323
 __unix_dgram_recvmsg+0xa05/0xe00 net/unix/af_unix.c:2544
 unix_dgram_recvmsg+0xce/0xf0 net/unix/af_unix.c:2561
 sock_recvmsg_nosec net/socket.c:1034 [inline]
 sock_recvmsg+0x185/0x1e0 net/socket.c:1056
 sock_read_iter+0x247/0x320 net/socket.c:1126
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x60e/0xc70 fs/read_write.c:570
 ksys_read+0x145/0x260 fs/read_write.c:713
 __do_sys_read fs/read_write.c:723 [inline]
 __se_sys_read fs/read_write.c:721 [inline]
 __x64_sys_read+0x7f/0x90 fs/read_write.c:721
 x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f07777c6407
Code: 48 89 fa 4c 89 df e8 38 aa 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:00007fff9baab590 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f0777676c80 RCX: 00007f07777c6407
RDX: 00000000000000ff RSI: 00005586dd9dc300 RDI: 0000000000000000
RBP: 00005586dd9dc2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005586dd9dc346
R13: 0000000000000000 R14: 00005586dd9dc300 R15: 00005586a349ad98
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.073 msecs