syzbot |
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| ID | Workflow | Result | Correct | Bug | Created | Started | Finished | Revision | Error |
|---|---|---|---|---|---|---|---|---|---|
| d1bd6154-6b0c-4e65-bfd6-493aaf4fb934 | assessment-security | DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ | ❓ | INFO: task hung in dvb_usb_i2c_exit | 2026/05/23 14:13 | 2026/05/23 14:13 | 2026/05/23 15:14 | c69befb30ac10e158cc9d1557b508ee3f0eca1de |
| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] Monthly usb report (Jun 2026) | 0 (1) | 2026/06/02 20:32 |
| [PATCH] media: cxusb: Initialize medion after checking intf | 1 (1) | 2025/05/13 23:01 |
| [syzbot] [usb?] INFO: task hung in dvb_usb_i2c_exit | 2 (5) | 2025/05/13 18:26 |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| linux-6.1 | INFO: task hung in dvb_usb_i2c_exit origin:upstream | 1 | syz | error | 4 | 111d | 182d | 0/3 | upstream: reported syz repro on 2025/12/21 20:30 | |
| linux-6.6 | INFO: task hung in dvb_usb_i2c_exit | 1 | 1 | 6d15h | 6d15h | 0/2 | upstream: reported on 2026/06/15 09:38 | |||
| linux-5.15 | INFO: task hung in dvb_usb_i2c_exit | 1 | 2 | 34d | 92d | 0/3 | upstream: reported on 2026/03/21 18:18 |
INFO: task kworker/0:3:5829 blocked for more than 143 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3 state:D stack:22760 pid:5829 tgid:5829 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
i2c_del_adapter+0x546/0x6f0 drivers/i2c/i2c-core-base.c:1812
dvb_usb_i2c_exit+0x9f/0xf0 drivers/media/usb/dvb-usb/dvb-usb-i2c.c:46
dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:144 [inline]
dvb_usb_device_exit+0x334/0x580 drivers/media/usb/dvb-usb/dvb-usb-init.c:338
cxusb_probe+0x1c9/0x7d0 drivers/media/usb/dvb-usb/cxusb.c:1664
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3692
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5531 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
port_event drivers/usb/core/hub.c:5831 [inline]
hub_event+0x2eb7/0x4fa0 drivers/usb/core/hub.c:5913
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
INFO: task syz-executor329:5845 blocked for more than 143 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor329 state:D stack:28168 pid:5845 tgid:5845 ppid:5817 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdf4207851
RSP: 002b:00007ffe7889bab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcdf4207851
RDX: 0000000000000002 RSI: 00007ffe7889bb50 RDI: 00000000ffffff9c
RBP: 00007ffe7889bb50 R08: 000000000000000f R09: 00232d6332692f76
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7889bf80
R13: 00007ffe7889bfa0 R14: 0000000000010006 R15: 00007ffe7889bf7c
</TASK>
INFO: task syz-executor329:5847 blocked for more than 144 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor329 state:D stack:28792 pid:5847 tgid:5847 ppid:5820 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdf4207851
RSP: 002b:00007ffe7889bab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcdf4207851
RDX: 0000000000000002 RSI: 00007ffe7889bb50 RDI: 00000000ffffff9c
RBP: 00007ffe7889bb50 R08: 000000000000000f R09: 00232d6332692f76
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7889bf80
R13: 00007ffe7889bfa0 R14: 0000000000010005 R15: 00007ffe7889bf7c
</TASK>
INFO: task syz-executor329:5848 blocked for more than 144 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor329 state:D stack:28184 pid:5848 tgid:5848 ppid:5814 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdf4207851
RSP: 002b:00007ffe7889bab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcdf4207851
RDX: 0000000000000002 RSI: 00007ffe7889bb50 RDI: 00000000ffffff9c
RBP: 00007ffe7889bb50 R08: 000000000000000f R09: 00232d6332692f76
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7889bf80
R13: 00007ffe7889bfa0 R14: 000000000000ffeb R15: 00007ffe7889bf7c
</TASK>
INFO: task syz-executor329:5850 blocked for more than 144 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor329 state:D stack:27560 pid:5850 tgid:5850 ppid:5813 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdf4207851
RSP: 002b:00007ffe7889bab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcdf4207851
RDX: 0000000000000002 RSI: 00007ffe7889bb50 RDI: 00000000ffffff9c
RBP: 00007ffe7889bb50 R08: 000000000000000f R09: 00232d6332692f76
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7889bf80
R13: 00007ffe7889bfa0 R14: 000000000000ffeb R15: 00007ffe7889bf7c
</TASK>
INFO: task syz-executor329:5851 blocked for more than 145 seconds.
Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor329 state:D stack:27560 pid:5851 tgid:5851 ppid:5819 task_flags:0x400040 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcdf4207851
RSP: 002b:00007ffe7889bab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcdf4207851
RDX: 0000000000000002 RSI: 00007ffe7889bb50 RDI: 00000000ffffff9c
RBP: 00007ffe7889bb50 R08: 000000000000000f R09: 00232d6332692f76
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe7889bf80
R13: 00007ffe7889bfa0 R14: 000000000001054d R15: 00007ffe7889bf7c
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3bf5c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by getty/5579:
#0: ffff8880326d60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
5 locks held by kworker/0:3/5829:
#0: ffff88801f284948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc9000412fd18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#2: ffff888145310198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c0/0x4fa0 drivers/usb/core/hub.c:5859
#3: ffff88807f727198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#3: ffff88807f727198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4: ffff88807ccea160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#4: ffff88807ccea160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
4 locks held by udevd/5834:
#0: ffff88802e1f38b8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1: ffff88802c20a088 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88802f69a4b8 (kn->active#18){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88807f727198 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:927 [inline]
#3: ffff88807f727198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
1 lock held by syz-executor329/5845:
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
1 lock held by syz-executor329/5847:
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
1 lock held by syz-executor329/5848:
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
1 lock held by syz-executor329/5850:
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
1 lock held by syz-executor329/5851:
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#0: ffff888145310198 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x1b6/0x8b0 drivers/usb/core/devio.c:1054
2 locks held by dhcpcd/5861:
#0: ffff888012f64408 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888012f64408 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:646
#1: ffffffff8e3caaf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x280/0x3c0 kernel/rcu/tree_exp.h:304
2 locks held by dhcpcd/5862:
#0: ffff888012f62c08 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888012f62c08 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:646
#1: ffffffff8e3caaf8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
Code: 95 62 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 aa 1d 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e007e10 EFLAGS: 000002c6
RAX: 00000000000e2f7d RBX: 0000000000000000 RCX: ffffffff8b6c4419
RDX: 0000000000000000 RSI: ffffffff8dbdf8c1 RDI: ffffffff8bf47e20
RBP: fffffbfff1c12ee8 R08: 0000000000000001 R09: ffffed10170865bd
R10: ffff8880b8432deb R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8e097740 R14: ffffffff9084f110 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881249e4000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b05125c680 CR3: 000000000e180000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
rest_init+0x16b/0x2b0 init/main.c:743
start_kernel+0x3e9/0x4d0 init/main.c:1099
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0xb0/0xc0 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x148
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/04/29 21:17 | upstream | ca91b9500108 | aeb6ec69 | .config | strace log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | |
| 2026/06/19 10:13 | upstream | 8c13415c8a43 | d7ffd47b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-smack-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/19 08:42 | upstream | 8c13415c8a43 | d7ffd47b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-smack-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/19 08:21 | upstream | 8c13415c8a43 | d7ffd47b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-smack-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/16 19:58 | upstream | 6b5a2b7d9bc1 | 0e4b3e40 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/13 00:56 | upstream | 1dadb7e7eb5a | 1d2f3589 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/12 23:13 | upstream | 1dadb7e7eb5a | 1d2f3589 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/05 06:14 | upstream | 9154c4af7829 | 197909be | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/05 03:17 | upstream | 9154c4af7829 | 197909be | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/04 09:53 | upstream | ba3e43a9e601 | 197909be | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-smack-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/03 14:49 | upstream | ba3e43a9e601 | 234057e5 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/02 18:44 | upstream | 6f3ed7fec72f | 62fe1528 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/02 04:52 | upstream | e43ffb69e043 | 1095583b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/28 12:14 | upstream | eb3f4b7426cf | 9a5a7e5e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/25 23:53 | upstream | e7ae89a0c97c | c69befb3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-smack-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/22 23:30 | upstream | cca95436be15 | c69befb3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/22 03:06 | upstream | 6779b50faa56 | e195359d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/22 03:01 | upstream | 6779b50faa56 | e195359d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/21 06:19 | upstream | df685633c3db | 41b8c833 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/17 22:13 | upstream | e5d505e3664b | de5aae85 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/17 09:02 | upstream | 6916d5703ddf | de5aae85 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/15 22:33 | upstream | d458a240344c | 81fb92f3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/15 02:01 | upstream | 66182ca873a4 | 6ccb967e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/13 00:03 | upstream | c21b90f77687 | a0949470 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/12 17:55 | upstream | 50897c955902 | d5b1a17d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/12 07:02 | upstream | 50897c955902 | d168f260 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/11 11:23 | upstream | 5d6919055dec | e6eb7c0b | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/07 15:11 | upstream | 5862221fdded | f250db59 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/02 06:56 | upstream | ef5f46b63023 | 753c55b9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/01 10:04 | upstream | 26fd6bff2c05 | 753c55b9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/04/29 16:53 | upstream | 57b8e2d666a3 | 804ea88f | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/04/28 18:32 | upstream | 3b3bea6d4b9c | b4209743 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/04/27 16:56 | upstream | 254f49634ee1 | 0f700595 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/01/20 06:03 | upstream | 24d479d26b25 | d6526ea3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | INFO: task hung in dvb_usb_i2c_exit | ||
| 2025/04/27 20:49 | upstream | 5bc1018675ec | c6b4fb39 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/21 18:21 | upstream | 390d73adf896 | 43bfcdb0 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/06/18 18:39 | upstream | e771677c937d | a776b0d0 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/24 09:28 | upstream | 4cbfe4502e3d | c69befb3 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/22 07:20 | upstream | 6779b50faa56 | e195359d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/18 16:23 | upstream | 5200f5f493f7 | 55156e84 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/18 03:23 | upstream | e5d505e3664b | de5aae85 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/18 02:16 | upstream | e5d505e3664b | de5aae85 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/15 20:14 | upstream | 70eda68668d1 | 9cd3beaa | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/01 15:34 | upstream | 26fd6bff2c05 | 753c55b9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/01 05:01 | upstream | 08d0d3466664 | 753c55b9 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-386 | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/10 15:37 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/10 13:16 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/10 08:36 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/10 04:16 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/10 02:33 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/05/09 18:44 | linux-next | e98d21c170b0 | 29233ece | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-rust-kasan-gce | INFO: task hung in dvb_usb_i2c_exit | ||
| 2026/03/24 02:15 | linux-next | 09c0f7f1bcdb | baf8bf12 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-linux-next-kasan-gce-root | INFO: task hung in dvb_usb_i2c_exit |