INFO: task syz-executor.0:11141 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29216 pid:11141 ppid: 12229 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x941/0x22b0 kernel/sched/core.c:5940 schedule+0xcf/0x270 kernel/sched/core.c:6019 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:6078 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x786/0x1060 kernel/locking/mutex.c:1104 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+0x4c3/0x1110 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231 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: 0033:0x4196d4 RSP: 002b:00007f377c451cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004196d4 RDX: 0000000000000002 RSI: 00007f377c451d60 RDI: 00000000ffffff9c RBP: 00007f377c451d60 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffcb38ffddf R14: 00007f377c452300 R15: 0000000000022000 INFO: task syz-executor.3:11136 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29120 pid:11136 ppid: 4719 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x941/0x22b0 kernel/sched/core.c:5940 schedule+0xcf/0x270 kernel/sched/core.c:6019 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:6078 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x786/0x1060 kernel/locking/mutex.c:1104 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+0x4c3/0x1110 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231 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: 0033:0x4196d4 RSP: 002b:00007f209c9cbcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004196d4 RDX: 0000000000000002 RSI: 00007f209c9cbd60 RDI: 00000000ffffff9c RBP: 00007f209c9cbd60 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffc5d86329f R14: 00007f209c9cc300 R15: 0000000000022000 INFO: task syz-executor.2:11159 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27248 pid:11159 ppid: 18332 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x941/0x22b0 kernel/sched/core.c:5940 schedule+0xcf/0x270 kernel/sched/core.c:6019 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:6078 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x786/0x1060 kernel/locking/mutex.c:1104 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+0x4c3/0x1110 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231 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: 0033:0x4196d4 RSP: 002b:00007f5f22f5dcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004196d4 RDX: 0000000000000002 RSI: 00007f5f22f5dd60 RDI: 00000000ffffff9c RBP: 00007f5f22f5dd60 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffff978398f R14: 00007f5f22f5e300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1218: #0: ffffffff8767e500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6446 2 locks held by in:imklog/4301: #0: ffff88810971a0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 #1: ffffffff8766ec98 (syslog_lock){....}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:975 [inline] #1: ffffffff8766ec98 (syslog_lock){....}-{2:2}, at: debug_check_no_obj_freed+0xc7/0x420 lib/debugobjects.c:1018 6 locks held by kworker/1:7/22656: #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88810a155938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x15b0 kernel/workqueue.c:2247 #1: ffffc9000341fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15b0 kernel/workqueue.c:2251 #2: ffff88810f83c220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #2: ffff88810f83c220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff888118f4e220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #3: ffff888118f4e220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:940 #4: ffff88810a17e1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:754 [inline] #4: ffff88810a17e1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:940 #5: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev drivers/usb/core/file.c:187 [inline] #5: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_register_dev+0x19d/0x7e0 drivers/usb/core/file.c:156 2 locks held by agetty/1641: #0: ffff8881418b1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900005ab2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 2 locks held by syz-executor.4/11140: #0: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88811c3638d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 2 locks held by syz-executor.0/11141: #0: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88811c3638d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 2 locks held by syz-executor.3/11136: #0: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88811c3638d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 2 locks held by syz-executor.2/11159: #0: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88811c3638d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 1 lock held by syz-executor.1/11671: #0: ffffffff87f799f0 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1218 Comm: khungtaskd Not tainted 5.14.0-rc3-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:105 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1da/0x200 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+0xcf4/0xf90 kernel/hung_task.c:295 kthread+0x3c0/0x4a0 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: 2655 Comm: systemd-journal Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__kasan_check_read+0x0/0x10 mm/kasan/shadow.c:31 Code: 87 e8 06 e5 23 04 48 85 db 0f 85 d3 29 25 04 48 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 d3 2a 25 04 cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 23 f9 ff ff 0f 1f 00 48 8b 0c 24 89 f6 RSP: 0018:ffffc90000217930 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8881f684f4c0 RCX: 0000000000000001 RDX: 1ffff1103ed0a008 RSI: 0000000000000008 RDI: ffffffff888f00c0 RBP: 1ffff92000042f35 R08: 0000000000000000 R09: ffffffff888f00d7 R10: fffffbfff111e01a R11: 0000000000000001 R12: 00000001000468f9 R13: 0000000000000000 R14: ffff8881f684f590 R15: 0000000000000000 FS: 00007f92808f78c0(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f927cf8c028 CR3: 00000001059b8000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] cpumask_test_cpu include/linux/cpumask.h:344 [inline] cpu_active include/linux/cpumask.h:910 [inline] newidle_balance+0x226/0xfa0 kernel/sched/fair.c:10716 pick_next_task_fair+0x48/0xc40 kernel/sched/fair.c:7313 __pick_next_task kernel/sched/core.c:5304 [inline] pick_next_task kernel/sched/core.c:5774 [inline] __schedule+0x3ad/0x22b0 kernel/sched/core.c:5904 schedule+0xcf/0x270 kernel/sched/core.c:6019 schedule_hrtimeout_range_clock+0x359/0x3a0 kernel/time/hrtimer.c:2148 ep_poll fs/eventpoll.c:1848 [inline] do_epoll_wait+0x1283/0x1950 fs/eventpoll.c:2226 __do_sys_epoll_wait fs/eventpoll.c:2238 [inline] __se_sys_epoll_wait fs/eventpoll.c:2233 [inline] __x64_sys_epoll_wait+0x158/0x270 fs/eventpoll.c:2233 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: 0033:0x7f927fbc0303 Code: 49 89 ca b8 e8 00 00 00 0f 05 48 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 49 89 ca b8 e8 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 51 c2 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fffcadf8ad0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055d856b951e0 RCX: 00007f927fbc0303 RDX: 0000000000000013 RSI: 00007fffcadf8ae0 RDI: 0000000000000008 RBP: 00007fffcadf8cd0 R08: 00000000610ac3cd R09: 00007fffcae2c080 R10: 00000000ffffffff R11: 0000000000000293 R12: 00007fffcadf8ae0 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005c8be823af57b