watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.6:11294] Modules linked in: irq event stamp: 3836851 hardirqs last enabled at (3836850): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (3836851): [] sysvec_apic_timer_interrupt+0xf/0xc0 softirqs last enabled at (3812612): [] irq_exit_rcu+0x11f/0x190 softirqs last disabled at (3812615): [] irq_exit_rcu+0x11f/0x190 CPU: 0 PID: 11294 Comm: syz-executor.6 Not tainted 6.2.0-rc4-next-20230116 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:preempt_count_add+0x2a/0x150 Code: f3 0f 1e fa 48 c7 c0 c0 3f 9e 87 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 08 84 d2 0f 85 e9 00 00 00 8b 15 84 3a 7c 06 65 01 1d 45 RSP: 0018:ffff88806ce09710 EFLAGS: 00000206 RAX: 0000000000000003 RBX: 0000000000000001 RCX: 1ffffffff0f3c7f8 RDX: 0000000000000004 RSI: ffffffff844487c4 RDI: 0000000000000001 RBP: ffff88806ce09800 R08: ffffffff8609d4f8 R09: ffffffff8609d4fc R10: 0000000000000000 R11: ffff88806ce097e8 R12: ffff88806ce09870 R13: 0000000000000000 R14: ffff88806ce097a8 R15: 0000000000000820 FS: 00007f52a6fc3700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0404b73a18 CR3: 0000000019edc000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: unwind_next_frame+0xb0/0x2130 arch_stack_walk+0x87/0xf0 stack_trace_save+0x90/0xd0 kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc_node+0x187/0x310 __alloc_skb+0x21a/0x310 __netdev_alloc_skb+0x76/0x3e0 __ieee80211_beacon_get+0x3d9/0x13c0 ieee80211_beacon_get_tim+0x99/0x540 mac80211_hwsim_beacon_tx+0x1d2/0xb10 __iterate_interfaces+0x2d3/0x580 ieee80211_iterate_active_interfaces_atomic+0x73/0x1c0 mac80211_hwsim_beacon+0x105/0x200 __hrtimer_run_queues+0x54b/0xcb0 hrtimer_run_softirq+0x176/0x350 __do_softirq+0x274/0x8ff irq_exit_rcu+0x11f/0x190 sysvec_apic_timer_interrupt+0x92/0xc0 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:__folio_start_writeback+0x3f3/0x960 Code: 00 00 31 ff 48 89 ee e8 0b 43 e7 ff 48 85 ed 0f 85 14 02 00 00 e8 9d 46 e7 ff 44 89 fa be 15 00 00 00 48 89 df e8 8d 5c 1d 00 88 46 e7 ff 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 RSP: 0018:ffff888045406e58 EFLAGS: 00000206 RAX: 000000000039d6f9 RBX: ffffea0000d2ad40 RCX: ffffffff812b827f RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000200 R08: 0000000000000001 R09: ffffffff876589f7 R10: fffffbfff0ecb13e R11: 0000000000000001 R12: 1ffff11008a80dd1 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 __mpage_writepage+0x10c3/0x1700 write_cache_pages+0x3fa/0xd80 mpage_writepages+0xc6/0x170 do_writepages+0x1ad/0x650 filemap_fdatawrite_wbc+0x14b/0x1b0 __filemap_fdatawrite_range+0xba/0x100 file_write_and_wait_range+0xd2/0x140 __generic_file_fsync+0x78/0x200 fat_file_fsync+0x77/0x200 vfs_fsync_range+0x141/0x230 generic_file_write_iter+0x25e/0x350 do_iter_readv_writev+0x211/0x3c0 do_iter_write+0x18b/0x700 vfs_iter_write+0x74/0xb0 iter_file_splice_write+0x73e/0xcb0 direct_splice_actor+0x113/0x180 splice_direct_to_actor+0x33a/0x8c0 do_splice_direct+0x1bc/0x290 do_sendfile+0xb1d/0x12c0 __x64_sys_sendfile64+0x1d5/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f52a9a4db19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f52a6fc3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f52a9b60f60 RCX: 00007f52a9a4db19 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007f52a9aa7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 00000000fffffdef R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffa3a297ff R14: 00007f52a6fc3300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 Process accounting resumed Process accounting resumed loop4: detected capacity change from 0 to 16 ext4: Unknown parameter 'Äk‰¡~ýÝŽëE²5 Ø†|' loop4: detected capacity change from 0 to 16 ext4: Unknown parameter 'Äk‰¡~ýÝŽëE²5 Ø†|' ---------------- Code disassembly (best guess): 0: f3 0f 1e fa endbr64 4: 48 c7 c0 c0 3f 9e 87 mov $0xffffffff879e3fc0,%rax b: 55 push %rbp c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 13: fc ff df 16: 48 89 c1 mov %rax,%rcx 19: 53 push %rbx 1a: 83 e0 07 and $0x7,%eax 1d: 89 fb mov %edi,%ebx 1f: 48 c1 e9 03 shr $0x3,%rcx 23: 83 c0 03 add $0x3,%eax 26: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx * 2a: 38 d0 cmp %dl,%al <-- trapping instruction 2c: 7c 08 jl 0x36 2e: 84 d2 test %dl,%dl 30: 0f 85 e9 00 00 00 jne 0x11f 36: 8b 15 84 3a 7c 06 mov 0x67c3a84(%rip),%edx # 0x67c3ac0 3c: 65 gs 3d: 01 .byte 0x1 3e: 1d .byte 0x1d 3f: 45 rex.RB