loop5: detected capacity change from 0 to 40 syz-executor.5: attempt to access beyond end of device loop5: rw=2049, sector=124, nr_sectors = 4 limit=40 Buffer I/O error on dev loop5, logical block 31, lost async page write watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.5:10181] Modules linked in: irq event stamp: 2532871 hardirqs last enabled at (2532870): [] irqentry_exit+0x3b/0x90 hardirqs last disabled at (2532871): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (2490074): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (2490077): [] __irq_exit_rcu+0xc4/0x100 CPU: 1 UID: 0 PID: 10181 Comm: syz-executor.5 Not tainted 6.12.0-rc7-next-20241115 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:stack_access_ok+0xa/0x1d0 Code: 48 89 ef e8 88 52 77 00 eb da 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 b8 00 00 00 00 00 fc ff df <41> 56 41 55 41 54 49 89 d4 48 89 fa 55 48 c1 ea 03 48 89 f5 53 48 RSP: 0018:ffff88806cf09a00 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8683e66e RDX: 0000000000000008 RSI: ffff888041a3fbc0 RDI: ffff88806cf09a78 RBP: ffff88806cf09ad0 R08: ffffffff8683e672 R09: ffff88806cf09ab8 R10: 000000000003c001 R11: 0000000000023f91 R12: ffff88806cf09ad8 R13: ffff88806cf09ac0 R14: ffff888041a3fbc8 R15: ffff88806cf09a78 FS: 00007fe8dfe12700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d6a8e5cf40 CR3: 0000000036d00000 CR4: 0000000000350ef0 Call Trace: unwind_next_frame+0xa5c/0x2490 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 rcu_core+0x7c9/0x1790 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:qlist_free_all+0x59/0x160 Code: 89 c6 49 89 c6 e8 e7 f0 ff ff 49 89 c7 66 90 4c 89 f6 48 89 ef 48 8d 15 00 00 00 00 e8 80 f2 f8 ff 48 85 db 0f 84 9c 00 00 00 <48> 89 d8 4c 89 e5 4d 85 e4 75 ba b9 00 00 00 80 48 01 c1 0f 82 e0 RSP: 0018:ffff888041a3fb60 EFLAGS: 00000282 RAX: 0000000000238097 RBX: ffff88801b3695c8 RCX: 1ffffffff0fdfecf RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81849d96 RBP: ffff888008c4f780 R08: 0000000000000001 R09: fffffbfff0fdddf1 R10: ffffffff87eeef8f R11: 00000000000007e0 R12: 0000000000000000 R13: ffff888041a3fb98 R14: ffff88800d3adcb8 R15: ffff88800d3adcb8 kasan_quarantine_reduce+0x19f/0x240 __kasan_slab_alloc+0x49/0x70 kmem_cache_alloc_noprof+0x13d/0x3d0 __alloc_object+0x2f/0x270 __create_object+0x1d/0x80 kmem_cache_alloc_lru_noprof+0x303/0x3c0 __d_alloc+0x31/0x990 d_alloc_pseudo+0x1d/0xc0 alloc_file_pseudo+0xcc/0x200 __shmem_file_setup+0x214/0x310 __do_sys_memfd_create+0x4d7/0x980 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe8e28bdb19 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:00007fe8dfe11f48 EFLAGS: 00000246 ORIG_RAX: 000000000000013f RAX: ffffffffffffffda RBX: 0000000020002700 RCX: 00007fe8e28bdb19 RDX: 00000000000018d4 RSI: 0000000000000000 RDI: 00007fe8e29170fb RBP: 0000000000000007 R08: 0000000000000c6a R09: ffffffff00000000 R10: 0000000000000007 R11: 0000000000000246 R12: 0000000008100000 R13: 0000000020000340 R14: 00000000007ffff6 R15: 00000000200027c0 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at default_idle+0x1e/0x30 ---------------- Code disassembly (best guess): 0: 48 89 ef mov %rbp,%rdi 3: e8 88 52 77 00 callq 0x775290 8: eb da jmp 0xffffffe4 a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 41 56 push %r14 <-- trapping instruction 2c: 41 55 push %r13 2e: 41 54 push %r12 30: 49 89 d4 mov %rdx,%r12 33: 48 89 fa mov %rdi,%rdx 36: 55 push %rbp 37: 48 c1 ea 03 shr $0x3,%rdx 3b: 48 89 f5 mov %rsi,%rbp 3e: 53 push %rbx 3f: 48 rex.W