loop6: detected capacity change from 0 to 40 Buffer I/O error on dev loop6, logical block 10, lost async page write watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [syz-executor.3:4468] Modules linked in: irq event stamp: 258032 hardirqs last enabled at (258031): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (258032): [] sysvec_apic_timer_interrupt+0xf/0x90 softirqs last enabled at (258004): [] irq_exit_rcu+0x93/0xc0 softirqs last disabled at (257999): [] irq_exit_rcu+0x93/0xc0 CPU: 1 PID: 4468 Comm: syz-executor.3 Tainted: G L 6.4.0-rc6-next-20230613 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__ip6_append_data.isra.0+0xc5d/0x4560 Code: 48 c1 e8 03 42 80 3c 28 00 0f 85 8c 2e 00 00 48 8b 04 24 4c 8b 20 49 8d bc 24 f0 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 <0f> 85 61 2e 00 00 4d 8b a4 24 f0 00 00 00 31 ff 41 83 e4 01 4c 89 RSP: 0018:ffff8880430ff328 EFLAGS: 00000246 RAX: 1ffff11003d32c1e RBX: 0000000000000001 RCX: ffffc9000680f000 RDX: 0000000000040000 RSI: ffffffff83c33bdf RDI: ffff88801e9960f0 RBP: 0000000000000028 R08: 0000000000000006 R09: 000000000000ffd8 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801e996000 R13: dffffc0000000000 R14: ffff888019b483c0 R15: 0000000000000001 FS: 00007f86c2501700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555556fd098 CR3: 000000000d404000 CR4: 0000000000350ee0 Call Trace: ip6_append_data+0x1d4/0x530 rawv6_sendmsg+0x156e/0x3dc0 inet_sendmsg+0x121/0x150 sock_sendmsg+0x19b/0x200 splice_to_socket+0x949/0xe10 direct_splice_actor+0x119/0x180 splice_direct_to_actor+0x349/0x9d0 do_splice_direct+0x1bb/0x290 do_sendfile+0xb4b/0x12f0 __x64_sys_sendfile64+0x1d5/0x210 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7f86c4feeb19 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:00007f86c2501188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f86c51021a0 RCX: 00007f86c4feeb19 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006 RBP: 00007f86c5048f6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001a000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffe280775f R14: 00007f86c2501300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 243 Comm: syz-fuzzer Tainted: G L 6.4.0-rc6-next-20230613 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 Code: c0 e9 f9 c0 06 03 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 9d 81 b7 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 8b 03 00 a9 RSP: 0018:ffff88800e35f848 EFLAGS: 00000202 RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffffff844ac1aa RDX: ffff8880167fd1c0 RSI: 0000000000000000 RDI: 0000000000000001 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88800e35f950 R14: ffffffffffffffff R15: 1ffff11001c6bf0b FS: 000000c000030410(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000690000 CR3: 0000000009ba8000 CR4: 0000000000350ef0 Call Trace: mt_find+0x1a3/0x8b0 find_vma+0x110/0x1b0 walk_page_range+0x2b3/0x4b0 madvise_free_single_vma+0x42e/0x640 madvise_vma_behavior+0xb70/0x2340 do_madvise.part.0+0x39e/0x7a0 __x64_sys_madvise+0x10c/0x160 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x466507 Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 RSP: 002b:000000c000041e78 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: ffffffffffff0000 RCX: 0000000000466507 RDX: 0000000000000008 RSI: 0000000000002000 RDI: 000000c00d6a0000 RBP: 000000c000041eb8 R08: ffffffffffffffff R09: 0000000000000151 R10: 0000000000000005 R11: 0000000000000246 R12: 00000041fa2389d0 R13: 0000000000000001 R14: 00000041fa2389d0 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 9: 0f 85 8c 2e 00 00 jne 0x2e9b f: 48 8b 04 24 mov (%rsp),%rax 13: 4c 8b 20 mov (%rax),%r12 16: 49 8d bc 24 f0 00 00 lea 0xf0(%r12),%rdi 1d: 00 1e: 48 89 f8 mov %rdi,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) * 2a: 0f 85 61 2e 00 00 jne 0x2e91 <-- trapping instruction 30: 4d 8b a4 24 f0 00 00 mov 0xf0(%r12),%r12 37: 00 38: 31 ff xor %edi,%edi 3a: 41 83 e4 01 and $0x1,%r12d 3e: 4c rex.WR 3f: 89 .byte 0x89