INFO: task syz-executor.5:26020 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:25584 pid:26020 ppid: 6782 flags:0x00004004 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 nl80211_pre_doit+0x28/0x5b0 net/wireless/nl80211.c:14927 genl_family_rcv_msg_doit net/netlink/genetlink.c:726 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0xfd8/0x1480 net/netlink/genetlink.c:792 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0xa29/0xe50 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] __sys_sendto+0x560/0x720 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2044 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: 0033:0x7fd71a00069c RSP: 002b:00007fd7175a1f80 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fd7175a20f0 RCX: 00007fd71a00069c RDX: 0000000000000024 RSI: 00007fd7175a2140 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007fd7175a1fd4 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fd7175a2140 R14: 0000000000000004 R15: 0000000000000000 INFO: task syz-executor.5:26021 blocked for more than 144 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26448 pid:26021 ppid: 6782 flags:0x00004004 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 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0xa29/0xe50 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x36f/0x450 net/socket.c:2492 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: 0033:0x7fd71a04d709 RSP: 002b:00007fd717582188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd71a1520e0 RCX: 00007fd71a04d709 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000007 RBP: 00007fd71a0a7cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdf61bd32f R14: 00007fd717582300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/27: #0: ffffffff8c91c1c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by in:imklog/6229: #0: ffff888072103270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by agetty/6234: #0: ffff88801692d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900011182e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113 2 locks held by kworker/u4:8/13347: 3 locks held by kworker/1:24/14594: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc900047efd20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 2 locks held by systemd-udevd/21038: 1 lock held by systemd-udevd/21088: 2 locks held by kworker/u4:1/5510: #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9001289fd20 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 2 locks held by systemd-udevd/22181: #0: ffff888026b86460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:376 #1: ffff8880b9c1f888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c1/0x780 kernel/sched/psi.c:880 3 locks held by kworker/1:0/25489: #0: ffff888026171938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9000c65fd20 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590 3 locks held by kworker/1:3/7165: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90013a47d20 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 2 locks held by syz-executor.5/25989: #0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569 #1: ffffffff8c9209a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8c9209a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x277/0x750 kernel/rcu/tree_exp.h:837 2 locks held by syz-executor.5/26020: #0: ffffffff8d9bacd0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:802 #1: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x28/0x5b0 net/wireless/nl80211.c:14927 1 lock held by syz-executor.5/26021: #0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x8ed/0xe60 net/core/rtnetlink.c:5569 2 locks held by kworker/1:4/26023: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-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+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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8480 Comm: kworker/0:6 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:perf_trace_lock_acquire+0x100/0x4a0 include/trace/events/lock.h:13 Code: 00 00 00 49 8d 5e 18 48 89 d8 48 c1 e8 03 48 89 44 24 38 42 80 3c 38 00 74 08 48 89 df e8 68 3d 6a 00 48 89 5c 24 40 48 8b 03 <48> 85 c0 48 c7 c7 c0 f7 4e 8a 48 0f 45 f8 e8 fd 09 d4 02 48 89 44 RSP: 0018:ffffc9001796f6a0 EFLAGS: 00000046 RAX: ffffffff8a5d5760 RBX: ffffffff909bb418 RCX: 000000001796f703 RDX: 0000000000000000 RSI: ffffffff909bb400 RDI: ffffc9001796f720 RBP: ffffc9001796f7b8 R08: 0000000000000000 R09: 0000000000000001 R10: fffffbfff1bb7e6e R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff8c7ea9c0 R14: ffffffff909bb400 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3dd4037550 CR3: 000000000c68e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000d9a9 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_acquire+0x161/0x190 include/trace/events/lock.h:13 lock_acquire+0xa5/0x4d0 kernel/locking/lockdep.c:5596 __raw_spin_trylock include/linux/spinlock_api_smp.h:90 [inline] _raw_spin_trylock+0x42/0x70 kernel/locking/spinlock.c:138 kfence_guarded_alloc+0x2c3/0xbb0 mm/kfence/core.c:277 kfence_alloc include/linux/kfence.h:124 [inline] slab_alloc_node mm/slub.c:3124 [inline] kmem_cache_alloc_node+0x2fa/0x340 mm/slub.c:3242 __alloc_skb+0xd8/0x580 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1116 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x274/0xb20 drivers/net/netdevsim/dev.c:762 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 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 49 8d add %cl,-0x73(%rcx) 5: 5e pop %rsi 6: 18 48 89 sbb %cl,-0x77(%rax) 9: d8 48 c1 fmuls -0x3f(%rax) c: e8 03 48 89 44 callq 0x44894814 11: 24 38 and $0x38,%al 13: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 18: 74 08 je 0x22 1a: 48 89 df mov %rbx,%rdi 1d: e8 68 3d 6a 00 callq 0x6a3d8a 22: 48 89 5c 24 40 mov %rbx,0x40(%rsp) 27: 48 8b 03 mov (%rbx),%rax * 2a: 48 85 c0 test %rax,%rax <-- trapping instruction 2d: 48 c7 c7 c0 f7 4e 8a mov $0xffffffff8a4ef7c0,%rdi 34: 48 0f 45 f8 cmovne %rax,%rdi 38: e8 fd 09 d4 02 callq 0x2d40a3a 3d: 48 rex.W 3e: 89 .byte 0x89 3f: 44 rex.R