INFO: task syz-executor.4:4652 blocked for more than 143 seconds. Not tainted 5.16.0-rc2-next-20211125-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27648 pid: 4652 ppid: 8415 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4983 [inline] __schedule+0xab2/0x4d90 kernel/sched/core.c:6293 schedule+0xd2/0x260 kernel/sched/core.c:6366 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9890 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x60c/0x2c20 kernel/exit.c:787 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x34c/0x28b0 kernel/signal.c:2859 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fbfcde20ae9 RSP: 002b:00007fbfccd96218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fbfcdf33f68 RCX: 00007fbfcde20ae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fbfcdf33f68 RBP: 00007fbfcdf33f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbfcdf33f6c R13: 00007ffd8aa1299f R14: 00007fbfccd96300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb83220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 2 locks held by in:imklog/6248: #0: ffff888072a1b4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 #1: ffff8880b9d39d58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:489 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc2-next-20211125-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+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:256 [inline] watchdog+0xcb7/0xed0 kernel/hung_task.c:413 kthread+0x405/0x4f0 kernel/kthread.c:345 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2959 Comm: systemd-journal Not tainted 5.16.0-rc2-next-20211125-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count_sub+0x5f/0x150 kernel/sched/core.c:5483 Code: fc 0e 85 c9 75 1b 65 8b 05 1e 66 b2 7e 89 c2 81 e2 ff ff ff 7f 39 da 7c 13 81 fb fe 00 00 00 76 63 f7 db 65 01 1d 01 66 b2 7e <5b> c3 e8 fa d1 8f 02 85 c0 74 f5 48 c7 c0 08 7e 91 8d 48 ba 00 00 RSP: 0018:ffffc90000dd0790 EFLAGS: 00000297 RAX: 0000000080000101 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000101 RSI: ffffc900027eff58 RDI: 0000000000000001 RBP: 00007ffe9ed40b58 R08: ffffffff8ea52f1a R09: 0000000000000001 R10: fffff520001ba11a R11: 000000000008808a R12: ffffc900027e8000 R13: ffffc900027eff58 R14: ffffc90000dd0878 R15: ffffc900027eff58 FS: 00007fbcac70b8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbca9b5e000 CR3: 000000001b0e5000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xee1/0x1ce0 arch/x86/kernel/unwind_orc.c:624 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0x103/0x170 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kmem_cache_free+0xba/0x4a0 mm/slub.c:3530 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:700 __kfree_skb net/core/skbuff.c:757 [inline] consume_skb net/core/skbuff.c:912 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:906 mac80211_hwsim_tx_frame+0x1f6/0x2a0 drivers/net/wireless/mac80211_hwsim.c:1785 mac80211_hwsim_beacon_tx+0x49b/0x930 drivers/net/wireless/mac80211_hwsim.c:1838 __iterate_interfaces+0x1e5/0x560 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829 mac80211_hwsim_beacon+0xcd/0x1c0 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:87 [inline] RIP: 0010:syscall_enter_from_user_mode+0x2b/0x70 kernel/entry/common.c:108 Code: 54 49 89 f4 55 48 89 fd 48 8b 7c 24 10 e8 cd f5 ff ff eb 27 eb 2b e8 f4 bc 2f f8 e8 2f bb 2f f8 fb 65 48 8b 04 25 40 70 02 00 <48> 8b 70 08 40 f6 c6 3f 75 19 4c 89 e0 5d 41 5c c3 eb 1b 0f 0b eb RSP: 0018:ffffc900027eff28 EFLAGS: 00000202 RAX: ffff88807bb01d40 RBX: 0000000000000000 RCX: 1ffffffff1b223e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900027eff58 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817e2d88 R11: 0000000000000000 R12: 0000000000000015 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fbcab9c69c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe9ed40b58 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffe9ed43a70 RCX: 00007fbcab9c69c7 RDX: 00007fbcac437a00 RSI: 0000000000000000 RDI: 0000556ba49329a3 RBP: 00007ffe9ed40b90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffe9ed43a70 R15: 00007ffe9ed41080 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 85 c9 test %ecx,%ecx 2: 75 1b jne 0x1f 4: 65 8b 05 1e 66 b2 7e mov %gs:0x7eb2661e(%rip),%eax # 0x7eb26629 b: 89 c2 mov %eax,%edx d: 81 e2 ff ff ff 7f and $0x7fffffff,%edx 13: 39 da cmp %ebx,%edx 15: 7c 13 jl 0x2a 17: 81 fb fe 00 00 00 cmp $0xfe,%ebx 1d: 76 63 jbe 0x82 1f: f7 db neg %ebx 21: 65 01 1d 01 66 b2 7e add %ebx,%gs:0x7eb26601(%rip) # 0x7eb26629 * 28: 5b pop %rbx <-- trapping instruction 29: c3 retq 2a: e8 fa d1 8f 02 callq 0x28fd229 2f: 85 c0 test %eax,%eax 31: 74 f5 je 0x28 33: 48 c7 c0 08 7e 91 8d mov $0xffffffff8d917e08,%rax 3a: 48 rex.W 3b: ba .byte 0xba