INFO: task syz-executor.2:17403 blocked for more than 143 seconds. Not tainted 5.15.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26160 pid:17403 ppid: 6565 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x2da/0x480 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x46/0x60 kernel/sched/completion.c:157 usb_start_wait_urb+0x160/0x530 drivers/usb/core/message.c:63 do_proc_bulk+0x970/0x1060 drivers/usb/core/devio.c:1236 proc_bulk_compat drivers/usb/core/devio.c:2057 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2608 [inline] usbdev_ioctl+0x10d3/0x6d00 drivers/usb/core/devio.c:2713 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f797463a709 RSP: 002b:00007f7971bb1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f797473ef60 RCX: 00007f797463a709 RDX: 0000000020000740 RSI: 00000000c0105502 RDI: 0000000000000003 RBP: 00007f7974694cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd3052b80f R14: 00007f7971bb1300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c91c180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 6 locks held by kworker/u4:4/1122: 1 lock held by in:imklog/6227: 4 locks held by kworker/1:7/8367: #0: ffff8880b9d31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9d31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9d31558 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9d31558 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x188/0x1270 kernel/sched/core.c:6201 #1: ffff8880b9d1f888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c1/0x780 kernel/sched/psi.c:880 #2: ffff8880b9d1feb8 (krc.lock){..-.}-{2:2}, at: kfree_rcu_monitor+0x27/0x700 kernel/rcu/tree.c:3334 #3: ffff8880b9d200d8 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x6d3/0xd20 kernel/time/timer.c:1043 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc54/0xca0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2954 Comm: systemd-journal Not tainted 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held_type+0x125/0x190 kernel/locking/lockdep.c:5670 Code: 48 c7 c7 e0 00 4f 8a e8 d9 10 00 00 b8 ff ff ff ff 65 0f c1 05 2c 1f 09 76 83 f8 01 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b RSP: 0018:ffffc90002bdfc98 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002bdfd78 R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: 0000000000000246 R13: ffff88807b47b900 R14: 00000000ffffffff R15: ffffffff8c91c0e0 FS: 00007fb87b9be8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb878f16000 CR3: 000000001b32b000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125 trace_kmem_cache_free+0x2e/0xe0 include/trace/events/kmem.h:138 kmem_cache_free+0x140/0x180 mm/slub.c:3500 putname fs/namei.c:270 [inline] user_path_at_empty+0x149/0x1a0 fs/namei.c:2803 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x43f/0x940 fs/open.c:421 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb87ac799c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdbe595f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffdbe598fb0 RCX: 00007fb87ac799c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000056390c7069a3 RBP: 00007ffdbe5960d0 R08: 000056390c6fc3e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000056390d5fd8a0 R15: 00007ffdbe5965c0 ---------------- Code disassembly (best guess): 0: 48 c7 c7 e0 00 4f 8a mov $0xffffffff8a4f00e0,%rdi 7: e8 d9 10 00 00 callq 0x10e5 c: b8 ff ff ff ff mov $0xffffffff,%eax 11: 65 0f c1 05 2c 1f 09 xadd %eax,%gs:0x76091f2c(%rip) # 0x76091f45 18: 76 19: 83 f8 01 cmp $0x1,%eax 1c: 75 40 jne 0x5e 1e: 48 c7 04 24 00 00 00 movq $0x0,(%rsp) 25: 00 26: 9c pushfq 27: 8f 04 24 popq (%rsp) * 2a: f7 04 24 00 02 00 00 testl $0x200,(%rsp) <-- trapping instruction 31: 75 46 jne 0x79 33: 41 f7 c4 00 02 00 00 test $0x200,%r12d 3a: 74 01 je 0x3d 3c: fb sti 3d: 65 gs 3e: 48 rex.W 3f: 8b .byte 0x8b