syzbot


INFO: task hung in misc_open (3)

Status: auto-closed as invalid on 2020/10/12 03:30
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 770d, last: 762d
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in misc_open (2) 8 1055d 1056d 0/23 auto-closed as invalid on 2019/12/23 14:44
upstream INFO: task hung in misc_open 2 1392d 1473d 0/23 auto-closed as invalid on 2019/04/20 12:01
upstream INFO: task hung in misc_open (4) C error inconclusive 143 13d 547d 18/23 upstream: reported C repro on 2021/02/13 12:38

Sample crash report:
INFO: task syz-executor.5:15003 blocked for more than 143 seconds.
      Not tainted 5.8.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D27664 15003   7394 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x501/0x1290 fs/open.c:828
 do_open fs/namei.c:3243 [inline]
 path_openat+0x1bb9/0x2750 fs/namei.c:3360
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007fc0ffb48c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004f9540 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: ffffffffffffff9c
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007e1 R14: 00000000004cac3c R15: 00007fc0ffb496d4
INFO: task syz-executor.5:15006 blocked for more than 143 seconds.
      Not tainted 5.8.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28376 15006   7394 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x501/0x1290 fs/open.c:828
 do_open fs/namei.c:3243 [inline]
 path_openat+0x1bb9/0x2750 fs/namei.c:3360
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_open fs/open.c:1201 [inline]
 __se_sys_open fs/open.c:1199 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1199
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416921
Code: Bad RIP value.
RSP: 002b:00007fc0ffb05060 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fc0ffb05830 RCX: 0000000000416921
RDX: 0104007000009120 RSI: 0000000000000002 RDI: 00000000004c23bb
RBP: 0000000000000000 R08: 0000000000000090 R09: 00000000000000a8
R10: 00000000000000b3 R11: 0000000000000293 R12: 0000000000000070
R13: 0000000020000000 R14: 00000000004ce8d2 R15: 00007fc0ffb076d4
INFO: task syz-executor.5:15017 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28368 15017   7394 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x501/0x1290 fs/open.c:828
 do_open fs/namei.c:3243 [inline]
 path_openat+0x1bb9/0x2750 fs/namei.c:3360
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Bad RIP value.
RSP: 002b:00007fc0ffac4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004fa640 RCX: 000000000045cba9
RDX: 0000000000000001 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 000000000078c2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000825 R14: 00000000004cb115 R15: 00007fc0ffac56d4

Showing all locks held in the system:
1 lock held by khungtaskd/1106:
 #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
1 lock held by in:imklog/6499:
 #0: ffff8880a27a1370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
6 locks held by kworker/1:1/14921:
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8880a6518538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc9000d30fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
 #2: ffff8882179df218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #2: ffff8882179df218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b6/0x3e40 drivers/usb/core/hub.c:5522
 #3: ffff8880a6712218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #3: ffff8880a6712218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x3f0 drivers/base/dd.c:850
 #4: ffff8880a22091a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #4: ffff8880a22091a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x3f0 drivers/base/dd.c:850
 #5: ffff88804fd68ca0 (&dev->phy_mutex){+.+.}-{3:3}, at: asix_mdio_read+0x9a/0x2a0 drivers/net/usb/asix_common.c:452
2 locks held by syz-executor.5/15002:
 #0: ffffffff8a19eca8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
 #1: ffffffff89b95f68 (system_transition_mutex){+.+.}-{3:3}, at: snapshot_open+0x9b/0x3e0 kernel/power/user.c:54
1 lock held by syz-executor.5/15003:
 #0: ffffffff8a19eca8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor.5/15006:
 #0: ffffffff8a19eca8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor.5/15017:
 #0: ffffffff8a19eca8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1106 Comm: khungtaskd Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd7d/0x1000 kernel/hung_task.c:295
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14921 Comm: kworker/1:1 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:get_work_pool+0x37/0x1a0 kernel/workqueue.c:711
Code: 08 00 00 00 48 89 df e8 77 97 67 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 4a 01 00 00 48 8b 1b <e8> f4 56 9a 06 31 ff 89 c5 89 c6 e8 39 5c 28 00 85 ed 74 1e e8 b0
RSP: 0018:ffffc90000da8c90 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000101 RCX: ffffffff814b5a19
RDX: 1ffff1100aae12c4 RSI: 0000000000000008 RDI: ffff888055709620
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffff888055709627
R10: ffffed100aae12c4 R11: 0000000000000000 R12: ffff888055709620
R13: 0000000000000000 R14: ffff8880a7d09800 R15: 0000000000000040
FS:  0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9036265000 CR3: 000000009a1af000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __queue_work+0x227/0xff0 kernel/workqueue.c:1433
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1444 [inline]
 __run_timers.part.0+0x376/0xa20 kernel/time/timer.c:1773
 __run_timers kernel/time/timer.c:1745 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1786
 __do_softirq+0x34c/0xa60 kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu kernel/softirq.c:417 [inline]
 irq_exit_rcu+0x229/0x270 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1779 [inline]
RIP: 0010:vprintk_emit+0x64b/0x770 kernel/printk/printk.c:2020
Code: 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 0f 85 e8 00 00 00 48 83 3d 41 ba 57 08 00 74 6b e8 ba 93 16 00 48 89 df 57 9d <0f> 1f 44 00 00 e9 03 ff ff ff e8 a6 93 16 00 49 c1 ed 03 e8 bd 48
RSP: 0018:ffffc9000d30ec30 EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000246 RCX: ffffc90017399000
RDX: 0000000000040000 RSI: ffffffff815d2646 RDI: 0000000000000246
RBP: ffffc9000d30ec70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000057
R13: 1ffffffff1369c10 R14: 0000000000000200 R15: 0000000000000000
 dev_vprintk_emit+0x3eb/0x436 drivers/base/core.c:3883
 dev_printk_emit+0xba/0xf1 drivers/base/core.c:3894
 __netdev_printk+0x1c6/0x27a net/core/dev.c:10433
 netdev_err+0xd7/0x109 net/core/dev.c:10485
 asix_set_sw_mii drivers/net/usb/asix_common.c:278 [inline]
 asix_set_sw_mii drivers/net/usb/asix_common.c:272 [inline]
 asix_mdio_read.cold+0x6b/0xa3 drivers/net/usb/asix_common.c:454
 asix_phy_reset+0x104/0x170 drivers/net/usb/asix_devices.c:215
 ax88172_bind+0x412/0x570 drivers/net/usb/asix_devices.c:272
 usbnet_probe+0xb3e/0x2690 drivers/net/usb/usbnet.c:1737
 usb_probe_interface+0x2f7/0x780 drivers/usb/core/driver.c:374
 really_probe+0x282/0x8a0 drivers/base/dd.c:525
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:873
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1b00 drivers/base/core.c:2680
 usb_set_configuration+0xef6/0x17a0 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
 usb_probe_device+0xc6/0x210 drivers/usb/core/driver.c:272
 really_probe+0x282/0x8a0 drivers/base/dd.c:525
 driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701
 __device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x28d/0x3f0 drivers/base/dd.c:873
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xacf/0x1b00 drivers/base/core.c:2680
 usb_new_device.cold+0x748/0x103b drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5208 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x2033/0x3e40 drivers/usb/core/hub.c:5576
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2020/07/14 03:29 upstream 11ba468877bb f90ec899 .config log report
ci-upstream-kasan-gce-386 2020/07/05 19:14 upstream 7cc2a8ea1048 51095195 .config log report