INFO: task kworker/1:2:1912 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:2 state:D stack:24720 pid: 1912 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 INFO: task kworker/1:4:8064 blocked for more than 144 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:24312 pid: 8064 ppid: 2 flags:0x00004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 linkwatch_event+0xa/0x50 net/core/link_watch.c:251 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 INFO: task kworker/1:5:21809 blocked for more than 144 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:5 state:D stack:24336 pid:21809 ppid: 2 flags:0x00004000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8c91c180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/1:2/1912: #0: ffff888148031138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90005997d20 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590 1 lock held by systemd-udevd/2973: 1 lock held by in:imklog/6222: #0: ffff88801ec52870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 3 locks held by kworker/1:4/8064: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc900160ffd20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 2 locks held by kworker/u4:8/20151: 3 locks held by kworker/1:5/21809: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9001a43fd20 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 4 locks held by kworker/u4:10/1011: 1 lock held by syz-executor.0/8292: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:684 [inline] #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3c/0x130 drivers/net/tun.c:3397 1 lock held by systemd-udevd/16535: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x277/0xf30 net/core/dev_ioctl.c:521 1 lock held by systemd-udevd/16575: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x277/0xf30 net/core/dev_ioctl.c:521 1 lock held by systemd-udevd/16578: 1 lock held by systemd-udevd/16623: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x277/0xf30 net/core/dev_ioctl.c:521 1 lock held by systemd-udevd/16651: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x277/0xf30 net/core/dev_ioctl.c:521 2 locks held by systemd-udevd/3690: #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x188/0x1270 kernel/sched/core.c:6201 #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: open_last_lookups fs/namei.c:3349 [inline] #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: path_openat+0x84a/0x3670 fs/namei.c:3558 3 locks held by systemd-udevd/3748: #0: ffff88807e166460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:376 #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: open_last_lookups fs/namei.c:3349 [inline] #1: ffff888077445350 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: path_openat+0x84a/0x3670 fs/namei.c:3558 #2: ffff888019f72660 (kn->active#2){++++}-{0:0}, at: kernfs_seq_start+0x6f/0x3b0 fs/kernfs/file.c:113 1 lock held by systemd-udevd/3840: 1 lock held by syz-executor.0/5874: #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc1-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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc54/0xca0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3840 Comm: systemd-udevd Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:193 Code: 84 00 00 00 00 00 0f 1f 40 00 be 0d 00 00 00 48 c7 c7 e0 8c 95 8c e8 6f 4e 4b 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc <48> 8b 04 24 65 48 8b 0c 25 c0 ef 01 00 65 8b 15 84 78 7f 7e f7 c2 RSP: 0018:ffffc9001926f328 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000010 RDX: ffff88814a121c80 RSI: 0000000000000005 RDI: 0000000000000003 RBP: ffff888017c36600 R08: ffffffff81adaa0d R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff888057d34ff8 R13: dffffc0000000000 R14: ffff88814a123310 R15: ffff888070cbb098 FS: 00007f0ee063f8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f20c45ed000 CR3: 000000019dc14000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: copy_from_kernel_nofault+0xe8/0x250 mm/maccess.c:39 prepend_copy fs/d_path.c:49 [inline] prepend fs/d_path.c:75 [inline] prepend_name fs/d_path.c:101 [inline] __prepend_path fs/d_path.c:133 [inline] prepend_path+0x4f8/0xb70 fs/d_path.c:173 d_absolute_path+0x191/0x320 fs/d_path.c:235 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x30f/0x610 security/tomoyo/realpath.c:276 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x22f/0x490 security/tomoyo/file.c:771 security_file_open+0x50/0x570 security/security.c:1634 do_dentry_open+0x36c/0x1020 fs/open.c:809 do_open fs/namei.c:3428 [inline] path_openat+0x28b4/0x3670 fs/namei.c:3561 do_filp_open+0x277/0x4f0 fs/namei.c:3588 do_sys_openat2+0x13b/0x500 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_open fs/open.c:1224 [inline] __se_sys_open fs/open.c:1220 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1220 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0edf785840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffda61670e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000701 RCX: 00007f0edf785840 RDX: 0000000000000001 RSI: 0000000000080000 RDI: 00007ffda61670f0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000012 R10: 0000000000000064 R11: 0000000000000246 R12: 00007ffda6168130 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000f ---------------- Code disassembly (best guess): 0: 84 00 test %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 0f 1f 40 00 nopl 0x0(%rax) a: be 0d 00 00 00 mov $0xd,%esi f: 48 c7 c7 e0 8c 95 8c mov $0xffffffff8c958ce0,%rdi 16: e8 6f 4e 4b 00 callq 0x4b4e8a 1b: c3 retq 1c: cc int3 1d: cc int3 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: cc int3 24: cc int3 25: cc int3 26: cc int3 27: cc int3 28: cc int3 29: cc int3 * 2a: 48 8b 04 24 mov (%rsp),%rax <-- trapping instruction 2e: 65 48 8b 0c 25 c0 ef mov %gs:0x1efc0,%rcx 35: 01 00 37: 65 8b 15 84 78 7f 7e mov %gs:0x7e7f7884(%rip),%edx # 0x7e7f78c2 3e: f7 .byte 0xf7 3f: c2 .byte 0xc2