INFO: task kworker/0:0:24772 blocked for more than 143 seconds. Not tainted 5.19.0-rc3-syzkaller-00175-g0a18d802d65c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:26824 pid:24772 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:5146 [inline] __schedule+0xa00/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6589 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747 addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4616 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8bd86ba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 3 locks held by kworker/u4:5/1323: 2 locks held by getty/3296: #0: ffff888026727098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002d162e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xe50/0x13c0 drivers/tty/n_tty.c:2124 3 locks held by kworker/1:4/3684: #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000416fda8 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffffffff8d58e828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4616 3 locks held by kworker/0:0/24772: #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff88814a39fd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc90002e4fda8 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffffffff8d58e828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4616 1 lock held by syz-executor.5/31426: #0: ffffffff8d58e828 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:697 [inline] #0: ffffffff8d58e828 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3454 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 5.19.0-rc3-syzkaller-00175-g0a18d802d65c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xc22/0xf90 kernel/hung_task.c:378 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3682 Comm: kworker/1:3 Not tainted 5.19.0-rc3-syzkaller-00175-g0a18d802d65c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 Workqueue: events nsim_dev_trap_report_work RIP: 0010:hlock_class kernel/locking/lockdep.c:222 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4752 [inline] RIP: 0010:__lock_acquire+0x6b7/0x5660 kernel/locking/lockdep.c:5003 Code: c0 74 08 3c 03 0f 8e 3a 2c 00 00 45 3b a5 58 0a 00 00 0f 8d 99 00 00 00 49 63 c4 48 8d 04 80 49 8d 1c c6 48 8d 7b 20 48 89 fa <48> c1 ea 03 42 0f b6 14 3a 84 d2 74 09 80 fa 03 0f 8e 27 2c 00 00 RSP: 0018:ffffc90003e2f870 EFLAGS: 00000097 RAX: 000000000000000f RBX: ffff88801dbcc5d8 RCX: ffffffff815df812 RDX: ffff88801dbcc5f8 RSI: 0000000000000008 RDI: ffff88801dbcc5f8 RBP: 0000000000000003 R08: 0000000000000000 R09: ffffffff9067f9f7 R10: fffffbfff20cff3e R11: 0000000000000001 R12: 0000000000000003 R13: ffff88801dbcbb00 R14: ffff88801dbcc560 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b8b905c078 CR3: 000000001f193000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ___slab_alloc+0x116/0xe20 mm/slub.c:2953 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4979 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1426 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:742 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:799 [inline] nsim_dev_trap_report_work+0x291/0xba0 drivers/net/netdevsim/dev.c:840 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 ---------------- Code disassembly (best guess): 0: c0 74 08 3c 03 shlb $0x3,0x3c(%rax,%rcx,1) 5: 0f 8e 3a 2c 00 00 jle 0x2c45 b: 45 3b a5 58 0a 00 00 cmp 0xa58(%r13),%r12d 12: 0f 8d 99 00 00 00 jge 0xb1 18: 49 63 c4 movslq %r12d,%rax 1b: 48 8d 04 80 lea (%rax,%rax,4),%rax 1f: 49 8d 1c c6 lea (%r14,%rax,8),%rbx 23: 48 8d 7b 20 lea 0x20(%rbx),%rdi 27: 48 89 fa mov %rdi,%rdx * 2a: 48 c1 ea 03 shr $0x3,%rdx <-- trapping instruction 2e: 42 0f b6 14 3a movzbl (%rdx,%r15,1),%edx 33: 84 d2 test %dl,%dl 35: 74 09 je 0x40 37: 80 fa 03 cmp $0x3,%dl 3a: 0f 8e 27 2c 00 00 jle 0x2c67