INFO: task syz-executor.5:24904 blocked for more than 143 seconds. Not tainted 5.15.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28256 pid:24904 ppid: 24188 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xb44/0x5960 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 usb_open+0x204/0x2e0 drivers/usb/core/file.c:48 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4c8/0x11d0 fs/open.c:822 do_open fs/namei.c:3428 [inline] path_openat+0x1c9a/0x2740 fs/namei.c:3561 do_filp_open+0x1aa/0x400 fs/namei.c:3588 do_sys_openat2+0x16d/0x4d0 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_openat fs/open.c:1232 [inline] __se_sys_openat fs/open.c:1227 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1227 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fecbae15954 RSP: 002b:00007fecb83b6cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fecbaf66020 RCX: 00007fecbae15954 RDX: 0000000000000002 RSI: 00007fecb83b6d60 RDI: 00000000ffffff9c RBP: 00007fecb83b6d60 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007fecbb499b2f R14: 00007fecb83b7300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b981b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by systemd-journal/2964: #0: ffff8880b9d31a58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:474 1 lock held by in:imklog/6364: #0: ffff88807b4d4370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 6 locks held by kworker/1:4/30160: #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888016312d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268 #1: ffffc900099b7db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272 #2: ffff88801e9ee220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #2: ffff88801e9ee220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff88806e8e9220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #3: ffff88806e8e9220 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x78e drivers/usb/core/hub.c:2216 #4: ffff888081d5b1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff888081d5b1a8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1032 [inline] #4: ffff888081d5b1a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal drivers/base/dd.c:1233 [inline] #4: ffff888081d5b1a8 (&dev->mutex){....}-{3:3}, at: device_release_driver+0x1c/0x40 drivers/base/dd.c:1259 #5: ffffffff8c81f970 (minor_rwsem#2){++++}-{3:3}, at: usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 2 locks held by syz-executor.4/24866: #0: ffffffff8c81f970 (minor_rwsem#2){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88807ef138d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 2 locks held by syz-executor.5/24904: #0: ffffffff8c81f970 (minor_rwsem#2){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88807ef138d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc6-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+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2964 Comm: systemd-journal Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:xas_move_index+0x4/0x110 lib/xarray.c:154 Code: 8b 3c 24 be 08 00 00 00 e8 99 11 c6 fd e9 68 fc ff ff 48 8b 7c 24 08 be 08 00 00 00 e8 95 11 c6 fd e9 ff fb ff ff 41 57 41 56 <41> 55 41 54 55 48 89 f5 53 48 89 fb e8 4b bb 7e fd 48 8d 7b 18 48 RSP: 0018:ffffc9000205f920 EFLAGS: 00000246 RAX: 0000000000000034 RBX: ffffc9000205fa28 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000035 RDI: ffffc9000205fa28 RBP: 0000000000000000 R08: 0000000000000002 R09: ffff8880b9d32a0b R10: ffffffff83f888b9 R11: 0000000000000040 R12: 0000000000000000 R13: dffffc0000000000 R14: fffffffffffffffe R15: 0000000000000034 FS: 00007f8b815428c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b7d30a000 CR3: 000000001eca1000 CR4: 00000000003526e0 Call Trace: xas_advance lib/xarray.c:163 [inline] xas_find+0x37e/0x7d0 lib/xarray.c:1271 find_get_entry mm/filemap.c:1978 [inline] find_lock_entries+0x155/0x13d0 mm/filemap.c:2092 shmem_undo_range+0x1dd/0x1730 mm/shmem.c:938 shmem_truncate_range mm/shmem.c:1058 [inline] shmem_setattr+0x59f/0x8f0 mm/shmem.c:1117 notify_change+0xaef/0x10c0 fs/attr.c:410 do_truncate+0x13c/0x200 fs/open.c:64 do_sys_ftruncate+0x544/0x740 fs/open.c:192 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f8b80804ec7 Code: 73 01 c3 48 8b 0d d1 5f 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 4d 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 5f 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffd03f96668 EFLAGS: 00000202 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007ffd03f966a0 RCX: 00007f8b80804ec7 RDX: 000055d7afc2be80 RSI: 0000000001800000 RDI: 0000000000000010 RBP: 00007ffd03f96698 R08: 0000000000000008 R09: 000055d7afc2c25c R10: 000055d7afc2c1e0 R11: 0000000000000202 R12: 000055d7afc2c1e0 R13: 00007ffd03f96798 R14: 000055d7aea9c958 R15: 0005ceeb75261403 ---------------- Code disassembly (best guess): 0: 8b 3c 24 mov (%rsp),%edi 3: be 08 00 00 00 mov $0x8,%esi 8: e8 99 11 c6 fd callq 0xfdc611a6 d: e9 68 fc ff ff jmpq 0xfffffc7a 12: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 17: be 08 00 00 00 mov $0x8,%esi 1c: e8 95 11 c6 fd callq 0xfdc611b6 21: e9 ff fb ff ff jmpq 0xfffffc25 26: 41 57 push %r15 28: 41 56 push %r14 * 2a: 41 55 push %r13 <-- trapping instruction 2c: 41 54 push %r12 2e: 55 push %rbp 2f: 48 89 f5 mov %rsi,%rbp 32: 53 push %rbx 33: 48 89 fb mov %rdi,%rbx 36: e8 4b bb 7e fd callq 0xfd7ebb86 3b: 48 8d 7b 18 lea 0x18(%rbx),%rdi 3f: 48 rex.W