watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.6:6989] Modules linked in: irq event stamp: 2843819 hardirqs last enabled at (2843818): [] irqentry_exit+0x3b/0x90 hardirqs last disabled at (2843819): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (2781346): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (2781353): [] irq_exit_rcu+0x94/0xc0 CPU: 0 UID: 0 PID: 6989 Comm: syz-executor.6 Not tainted 6.12.0-rc3-next-20241016 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:stack_trace_consume_entry+0x0/0x170 Code: 49 c7 c4 ea ff ff ff eb c7 e8 bc 98 43 03 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 b8 00 00 00 00 00 fc ff df 55 53 48 89 fb 48 83 c7 RSP: 0018:ffff88806ce09a70 EFLAGS: 00000286 RAX: ffffffff81148fd2 RBX: ffffffff813e8f70 RCX: ffffffff86bef301 RDX: 1ffff1100d9c135a RSI: ffffffff81148fd2 RDI: ffff88806ce09b40 RBP: ffff88806ce09b10 R08: ffffffff86bef3ea R09: ffff88806ce09ab8 R10: 000000000003c001 R11: 00000000000c329c R12: ffff88806ce09b40 R13: 0000000000000000 R14: ffff888016b48000 R15: ffff888019aeb8f8 FS: 00007fc07c2ef700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2eb21000 CR3: 0000000039bda000 CR4: 0000000000350ef0 Call Trace: arch_stack_walk+0x77/0xf0 stack_trace_save+0x8f/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x38/0x50 kmem_cache_free+0x138/0x470 rcu_core+0x7c9/0x1790 handle_softirqs+0x1b1/0x770 irq_exit_rcu+0x94/0xc0 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:unwind_next_frame+0x142/0x2490 Code: 7f 08 84 c0 0f 85 0d 09 00 00 48 89 e9 41 0f b6 47 41 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 0f 85 41 19 00 00 <49> 8b 4f 58 3c 01 48 83 d9 00 48 85 c9 0f 84 1c 03 00 00 48 81 f9 RSP: 0018:ffff88800e0bef08 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff11001c17dfa RDX: dffffc0000000000 RSI: ffffffff813e921f RDI: ffff88800e0bef78 RBP: ffff88800e0befd0 R08: 0000000000000001 R09: ffff88800e0befb8 R10: 000000000003c001 R11: 0000000000003f0d R12: ffff88800e0befd8 R13: ffff88800e0befc0 R14: ffff88800e0befb9 R15: ffff88800e0bef78 arch_stack_walk+0x87/0xf0 stack_trace_save+0x8f/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x38/0x50 kmem_cache_free+0x138/0x470 free_buffer_head+0x4a/0xe0 try_to_free_buffers+0x1a7/0x2b0 jbd2_journal_try_to_free_buffers+0x1e3/0x260 ext4_release_folio+0x181/0x350 filemap_release_folio+0x1df/0x270 mapping_evict_folio+0x1d4/0x250 mapping_try_invalidate+0x1c0/0x360 ext4_file_write_iter+0xdf0/0x1690 iter_file_splice_write+0xa09/0x1060 direct_splice_actor+0x192/0x7a0 splice_direct_to_actor+0x348/0x9d0 do_splice_direct+0x17a/0x250 do_sendfile+0xaf1/0xe40 __x64_sys_sendfile64+0x1d5/0x210 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc07ed9ab19 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:00007fc07c2ef188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fc07eeae020 RCX: 00007fc07ed9ab19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 00007fc07edf4f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcfbed557f R14: 00007fc07c2ef300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at default_idle+0x1e/0x30 syz_tun: left promiscuous mode ---------------- Code disassembly (best guess): 0: 49 c7 c4 ea ff ff ff mov $0xffffffffffffffea,%r12 7: eb c7 jmp 0xffffffd0 9: e8 bc 98 43 03 callq 0x34398ca e: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 15: 00 00 00 18: 66 90 xchg %ax,%ax 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 35: fc ff df 38: 55 push %rbp 39: 53 push %rbx 3a: 48 89 fb mov %rdi,%rbx 3d: 48 rex.W 3e: 83 .byte 0x83 3f: c7 .byte 0xc7