INFO: task syz.4.675:8423 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.675 state:D stack:28392 pid:8423 tgid:8419 ppid:5819 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xfe4/0x5e10 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7021
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0xc9a/0x1b90 kernel/locking/mutex.c:776
blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:562
sg_ioctl_common drivers/scsi/sg.c:1123 [inline]
sg_ioctl+0x22d/0x27a0 drivers/scsi/sg.c:1157
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2d5dd9aeb9
RSP: 002b:00007f2d5bbb2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2d5e016270 RCX: 00007f2d5dd9aeb9
RDX: 0000000020000000 RSI: 0000000000001276 RDI: 0000000000000008
RBP: 00007f2d5de08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2d5e016308 R14: 00007f2d5e016270 R15: 00007ffcc0cca818
Showing all locks held in the system:
3 locks held by kworker/0:1/10:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc900000f7c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
1 lock held by khungtaskd/31:
#0: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
3 locks held by kswapd1/88:
3 locks held by kworker/1:2/976:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90003937c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
1 lock held by klogd/5168:
2 locks held by udevd/5179:
2 locks held by dhcpcd/5473:
2 locks held by crond/5548:
2 locks held by getty/5566:
#0: ffff888032d400a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1500 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5792:
#0: ffff88807c51ccc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline]
#0: ffff88807c51ccc0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline]
#0: ffff88807c51ccc0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6f0 mm/mmap_lock.c:450
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4404 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4429 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4873 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_frozen_pages_noprof+0xa22/0x2410 mm/page_alloc.c:5253
3 locks held by syz-executor/5804:
#0: ffff8880359e61c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x5a0 mm/mmap_lock.c:259
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4404 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4429 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4873 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_frozen_pages_noprof+0xa22/0x2410 mm/page_alloc.c:5253
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: list_lru_count_one+0x2f/0x320 mm/list_lru.c:258
2 locks held by syz-executor/5805:
2 locks held by syz-executor/5806:
#0: ffff888028679bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline]
#0: ffff888028679bc0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline]
#0: ffff888028679bc0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x35/0x6f0 mm/mmap_lock.c:450
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4404 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4429 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4873 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_frozen_pages_noprof+0xa22/0x2410 mm/page_alloc.c:5253
3 locks held by kworker/0:3/5813:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc9000509fc98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
2 locks held by udevd/5815:
2 locks held by udevd/5827:
2 locks held by udevd/5828:
3 locks held by kworker/1:3/5872:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc900052b7c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
3 locks held by kworker/1:4/5879:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90005327c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
4 locks held by kworker/0:5/5886:
3 locks held by kworker/0:6/5893:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90005407c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
3 locks held by kworker/1:6/5953:
#0: ffff88813fe51948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90005537c98 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_lock net/openvswitch/datapath.c:108 [inline]
#2: ffffffff90959a28 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x24/0xf0 net/openvswitch/datapath.c:2561
1 lock held by udevd/6182:
3 locks held by syz.4.675/8422:
1 lock held by syz.4.675/8423:
#0: ffff88802667cb98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:562
2 locks held by udevd/8489:
2 locks held by syz-executor/8585:
1 lock held by syz.1.834/9038:
#0: ffff88802667cb98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x19e/0x330 kernel/trace/blktrace.c:788
1 lock held by syz.1.834/9042:
#0: ffff88802667cb98 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_remove+0x1f/0x40 kernel/trace/blktrace.c:562
3 locks held by syz-executor/9218:
4 locks held by syz.0.1011/9695:
#0: ffff88807c87d280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88807c87d280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x872/0x37c0 mm/filemap.c:3556
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4404 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4429 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath mm/page_alloc.c:4873 [inline]
#1: ffffffff8e7a14a0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_frozen_pages_noprof+0xa22/0x2410 mm/page_alloc.c:5253
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#2: ffffffff8e5e32e0 (rcu_read_lock){....}-{1:3}, at: list_lru_count_one+0x2f/0x320 mm/list_lru.c:258
#3: ffff8880b843ac98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:647 [inline]
#3: ffff8880b843ac98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:632
1 lock held by syz.6.1012/9697:
#0: ffff88807c9f2260 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline]
#0: ffff88807c9f2260 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x872/0x37c0 mm/filemap.c:3556
1 lock held by syz.6.1012/9699:
1 lock held by syz.3.1013/9700:
1 lock held by syz.5.1014/9701:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xcc3/0xfe0 kernel/hung_task.c:515
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x754/0xaf0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 56 78 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 83 ac 14 00 fb f4 fc 31 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0000:ffffffff8e207e00 EFLAGS: 00000242
RAX: 00000000027c8229 RBX: ffffffff8e297ac0 RCX: ffffffff8b76d4b5
RDX: 0000000000000000 RSI: ffffffff8dc45690 RDI: ffffffff8bfa3620
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed101708673d
R10: ffff8880b84339eb R11: 0000000000000000 R12: fffffbfff1c52f58
R13: 0000000000000000 R14: ffffffff90b749d0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556b9ff340 CR3: 0000000012479000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:767
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x35b/0x4b0 kernel/sched/idle.c:332
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
rest_init+0x251/0x260 init/main.c:757
start_kernel+0x47a/0x480 init/main.c:1206
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x122/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148