INFO: task syz-executor.5:8595 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28056 pid: 8595 ppid: 8454 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xbfd/0x11d0 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xcff/0x2630 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 paste_selection+0x155/0x500 drivers/tty/vt/selection.c:390 vt_ioctl+0x466/0x37f0 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0xf47/0x1750 drivers/tty/tty_io.c:2805 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f222ce9b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665f9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffcf83b25cf R14: 00007f222ce9b300 R15: 0000000000022000 INFO: task syz-executor.4:8615 blocked for more than 143 seconds. Not tainted 5.14.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27416 pid: 8615 ppid: 8452 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xbfd/0x11d0 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xcff/0x2630 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 paste_selection+0x155/0x500 drivers/tty/vt/selection.c:390 vt_ioctl+0x466/0x37f0 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0xf47/0x1750 drivers/tty/tty_io.c:2805 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+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f173f879188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcd9ff890f R14: 00007f173f879300 R15: 0000000000022000 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1637 Comm: khungtaskd Not tainted 5.14.0-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+0x1ae/0x29f lib/dump_stack.c:105 nmi_cpu_backtrace+0x405/0x430 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11208 Comm: kworker/0:19 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events free_obj_work RIP: 0010:unwind_next_frame+0xa8c/0x1fa0 arch/x86/kernel/unwind_orc.c:542 Code: 48 8b 44 24 70 42 8a 04 30 84 c0 48 8b 5c 24 78 48 8b 6c 24 20 0f 85 dd 11 00 00 c6 03 00 ba 10 00 00 00 48 8b 7c 24 28 31 f6 9f 30 92 00 e9 0a 05 00 00 48 89 5c 24 60 49 8d 7d 08 48 89 f8 RSP: 0018:ffffc9000251f5e0 EFLAGS: 00000246 RAX: 1ffff920004a3e00 RBX: ffffc9000251f6d5 RCX: 1ffff920004a3ed4 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000251f6f0 RBP: ffffffff8e811068 R08: 0000000000000001 R09: ffffc9000251f770 R10: fffff520004a3ee0 R11: 0000000000000000 R12: 1ffffffff1d0220d R13: ffffc9000251f6a0 R14: dffffc0000000000 R15: ffffffff8e81106c FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b93662000 CR3: 0000000035479000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0xb2/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x104/0x1e0 kernel/stacktrace.c:121 kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1628 [inline] slab_free_freelist_hook+0x1e8/0x2a0 mm/slub.c:1653 slab_free mm/slub.c:3213 [inline] kmem_cache_free+0x85/0x170 mm/slub.c:3229 free_obj_work+0x4c8/0x640 lib/debugobjects.c:338 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 48 8b 44 24 70 mov 0x70(%rsp),%rax 5: 42 8a 04 30 mov (%rax,%r14,1),%al 9: 84 c0 test %al,%al b: 48 8b 5c 24 78 mov 0x78(%rsp),%rbx 10: 48 8b 6c 24 20 mov 0x20(%rsp),%rbp 15: 0f 85 dd 11 00 00 jne 0x11f8 1b: c6 03 00 movb $0x0,(%rbx) 1e: ba 10 00 00 00 mov $0x10,%edx 23: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi 28: 31 f6 xor %esi,%esi * 2a: e8 9f 30 92 00 callq 0x9230ce <-- trapping instruction 2f: e9 0a 05 00 00 jmpq 0x53e 34: 48 89 5c 24 60 mov %rbx,0x60(%rsp) 39: 49 8d 7d 08 lea 0x8(%r13),%rdi 3d: 48 89 f8 mov %rdi,%rax