watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.4:4791] Modules linked in: irq event stamp: 4856639 hardirqs last enabled at (4856638): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (4856639): [] sysvec_apic_timer_interrupt+0xf/0xc0 softirqs last enabled at (4839966): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (4839969): [] __irq_exit_rcu+0x11b/0x180 CPU: 0 PID: 4791 Comm: syz-executor.4 Not tainted 6.2.0-rc1-next-20221226 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__stack_depot_save+0xc5/0x4e0 Code: 00 44 89 cb 44 89 c8 4c 89 fe 8b 16 03 5e 08 83 ef 03 48 83 c6 0c 03 46 f8 29 da 44 01 ca 41 89 d9 01 c3 41 c1 c1 04 44 31 ca <41> 89 d1 29 d0 01 da 41 c1 c1 06 44 31 c8 41 89 c1 29 c3 01 d0 41 RSP: 0018:ffff88806ce097c0 EFLAGS: 00000282 RAX: 00000000ac454104 RBX: 0000000081a90f9c RCX: 0000000000000011 RDX: 00000000b41e7c04 RSI: ffff88806ce09878 RDI: 0000000000000010 RBP: 0000000000000000 R08: 0000000000000011 R09: 00000000563ce98d R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000092a20 R15: ffff88806ce09830 FS: 00007f353827b700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2bf2c000 CR3: 000000000e42c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kasan_save_stack+0x35/0x50 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x5c/0x70 kmem_cache_alloc+0x1e1/0x410 __create_object+0x3d/0xc40 kmem_cache_alloc_node+0x283/0x420 __alloc_skb+0x21a/0x310 __netdev_alloc_skb+0x76/0x3e0 __ieee80211_beacon_get+0x3d9/0x1310 ieee80211_beacon_get_tim+0x99/0x4f0 mac80211_hwsim_beacon_tx+0x1d2/0xab0 __iterate_interfaces+0x2d3/0x560 ieee80211_iterate_active_interfaces_atomic+0x74/0x180 mac80211_hwsim_beacon+0x105/0x200 __hrtimer_run_queues+0x54b/0xc70 hrtimer_run_softirq+0x176/0x350 __do_softirq+0x1c7/0x8f9 __irq_exit_rcu+0x11b/0x180 irq_exit_rcu+0x9/0x30 sysvec_apic_timer_interrupt+0x92/0xc0 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:unwind_next_frame+0x15d8/0x2130 Code: 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 df 05 00 00 49 8d 7e 10 49 8b 6e 08 48 b8 00 00 00 00 00 fc ff df <48> 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b2 05 00 00 49 8b 46 10 48 RSP: 0018:ffff888046a0f210 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff888046a0ff58 RCX: 0000000000000001 RDX: 1ffff11008d41e53 RSI: ffff888046a0ff48 RDI: ffff888046a0f2a0 RBP: ffff888046a08000 R08: ffffffff86462316 R09: ffffffff8646231a R10: ffffed1008d41e5f R11: ffff888046a0f2d0 R12: ffff888046a0f2d1 R13: ffff888046a0f2f0 R14: ffff888046a0f290 R15: 0000000000000003 arch_stack_walk+0x87/0xf0 stack_trace_save+0x90/0xd0 kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x5c/0x70 kmem_cache_alloc+0x1e1/0x410 __create_object+0x3d/0xc40 __kmem_cache_alloc_node+0x25b/0x400 __kmalloc+0x46/0xc0 ext4_find_extent+0xa41/0xd30 ext4_ext_map_blocks+0x1c7/0x5d40 ext4_map_blocks+0xb15/0x19e0 ext4_append+0x1af/0x530 ext4_init_new_dir+0x262/0x4c0 ext4_mkdir+0x3d3/0xb20 vfs_mkdir+0x495/0x740 do_mkdirat+0x16e/0x2d0 __x64_sys_mkdir+0xf6/0x150 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f353ad25c27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f353827afa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f353ad25c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f353827b040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000020000100 R14: 00007f353827b000 R15: 0000000000000000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 ---------------- Code disassembly (best guess): 0: 00 44 89 cb add %al,-0x35(%rcx,%rcx,4) 4: 44 89 c8 mov %r9d,%eax 7: 4c 89 fe mov %r15,%rsi a: 8b 16 mov (%rsi),%edx c: 03 5e 08 add 0x8(%rsi),%ebx f: 83 ef 03 sub $0x3,%edi 12: 48 83 c6 0c add $0xc,%rsi 16: 03 46 f8 add -0x8(%rsi),%eax 19: 29 da sub %ebx,%edx 1b: 44 01 ca add %r9d,%edx 1e: 41 89 d9 mov %ebx,%r9d 21: 01 c3 add %eax,%ebx 23: 41 c1 c1 04 rol $0x4,%r9d 27: 44 31 ca xor %r9d,%edx * 2a: 41 89 d1 mov %edx,%r9d <-- trapping instruction 2d: 29 d0 sub %edx,%eax 2f: 01 da add %ebx,%edx 31: 41 c1 c1 06 rol $0x6,%r9d 35: 44 31 c8 xor %r9d,%eax 38: 41 89 c1 mov %eax,%r9d 3b: 29 c3 sub %eax,%ebx 3d: 01 d0 add %edx,%eax 3f: 41 rex.B