loop4: detected capacity change from 0 to 40 syz-executor.2: attempt to access beyond end of device loop2: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop2, logical block 10, lost async page write watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.4:7388] Modules linked in: irq event stamp: 2531753 hardirqs last enabled at (2531752): [] irqentry_exit+0x3b/0x90 hardirqs last disabled at (2531753): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (2509944): [] handle_softirqs+0x50c/0x770 softirqs last disabled at (2509947): [] __irq_exit_rcu+0xc4/0x100 CPU: 0 UID: 0 PID: 7388 Comm: syz-executor.4 Not tainted 6.12.0-next-20241128 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:stack_trace_consume_entry+0x4/0x170 Code: ff ff ff eb c7 e8 0c cf 45 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 f3 0f 1e fa <48> b8 00 00 00 00 00 fc ff df 55 53 48 89 fb 48 83 c7 10 48 89 fa RSP: 0018:ffff88806ce097d0 EFLAGS: 00000286 RAX: ffffffff81a0b4aa RBX: ffffffff813f1b50 RCX: 0000000000000001 RDX: 1ffff1100d9c1306 RSI: ffffffff81a0b4aa RDI: ffff88806ce098a0 RBP: ffff88806ce09870 R08: 0000000000000001 R09: ffff88806ce09818 R10: 000000000003c001 R11: 000000000002987f R12: ffff88806ce098a0 R13: 0000000000000000 R14: ffff88803e77d280 R15: ffff8880481b0c00 FS: 00007fd36ba96700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cf3d000 CR3: 0000000058e42000 CR4: 0000000000350ef0 Call Trace: arch_stack_walk+0x77/0xf0 stack_trace_save+0x8f/0xc0 kasan_save_stack+0x24/0x50 __kasan_record_aux_stack+0x8c/0xa0 __call_rcu_common.constprop.0+0x6a/0xaa0 kmem_cache_free+0x2ae/0x470 skb_release_data+0x814/0x990 consume_skb+0xd0/0x160 mac80211_hwsim_tx_frame+0x1f6/0x2a0 mac80211_hwsim_beacon_tx+0x546/0x950 __iterate_interfaces+0x2e0/0x650 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 mac80211_hwsim_beacon+0x105/0x200 __hrtimer_run_queues+0x1ab/0xa80 hrtimer_run_softirq+0x14c/0x310 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:memset_orig+0x33/0xb0 Code: b6 ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 41 89 f9 41 83 e1 07 75 70 48 89 d1 48 c1 e9 06 74 35 0f 1f 44 00 00 48 ff c9 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47 RSP: 0018:ffff88800ee2f798 EFLAGS: 00000206 RAX: ffffffffffffffff RBX: ffffffff857dd1f0 RCX: 0000000000000033 RDX: 0000000000001000 RSI: 00000000000000ff RDI: ffffed1002b23300 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: ffffed1002b23000 R11: 0000000000000000 R12: ffffffff857dd200 R13: 0000000015918000 R14: ffffea0000564600 R15: 0000000000000000 free_unref_page+0x2bb/0xe90 __put_partials+0xd8/0x110 qlist_free_all+0x50/0x160 kasan_quarantine_reduce+0x19f/0x240 __kasan_kmalloc+0x6f/0x90 __kmalloc_noprof+0x1f7/0x4b0 kmalloc_array_noprof+0x42/0x70 iter_file_splice_write+0x1a2/0x1060 direct_splice_actor+0x192/0x7a0 splice_direct_to_actor+0x348/0x9d0 do_splice_direct+0x17a/0x250 do_sendfile+0xaf4/0xe60 __x64_sys_sendfile64+0x1d5/0x210 do_syscall_64+0xbf/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd36e541b19 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:00007fd36ba96188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fd36e655020 RCX: 00007fd36e541b19 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006 RBP: 00007fd36e59bf6d R08: 0000000000000000 R09: 0000000000000000 R10: 00000000fffffdef R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0c789a1f R14: 00007fd36ba96300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at default_idle+0x1e/0x30 loop7: detected capacity change from 0 to 40 loop0: detected capacity change from 0 to 40 syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. ---------------- Code disassembly (best guess), 3 bytes skipped: 0: eb c7 jmp 0xffffffc9 2: e8 0c cf 45 03 callq 0x345cf13 7: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) e: 00 00 00 11: 66 90 xchg %ax,%ax 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: 90 nop 21: 90 nop 22: 90 nop 23: f3 0f 1e fa endbr64 * 27: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 2e: fc ff df 31: 55 push %rbp 32: 53 push %rbx 33: 48 89 fb mov %rdi,%rbx 36: 48 83 c7 10 add $0x10,%rdi 3a: 48 89 fa mov %rdi,%rdx