watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.3:4352] Modules linked in: irq event stamp: 323664 hardirqs last enabled at (323663): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (323664): [] sysvec_apic_timer_interrupt+0xf/0x90 softirqs last enabled at (323600): [] irq_exit_rcu+0x93/0xc0 softirqs last disabled at (323595): [] irq_exit_rcu+0x93/0xc0 CPU: 0 PID: 4352 Comm: syz-executor.3 Tainted: G L 6.4.0-rc6-next-20230614 #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 19 c4 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 bd 84 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:ffff8880454af320 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00000000000005c8 RCX: ffffffff83c341dc RDX: ffff8880159a0000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff888018dc1af0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff88800f258640 R15: 0000000000000001 FS: 00007f7847396700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f58f5d4c008 CR3: 00000000454a6000 CR4: 0000000000350ef0 Call Trace: __ip6_append_data.isra.0+0xbac/0x4560 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: 0033:0x7f7849e20b19 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:00007f7847396188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f7849f33f60 RCX: 00007f7849e20b19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000007 RBP: 00007f7849e7af6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001a000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda616f94f R14: 00007f7847396300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4368 Comm: syz-executor.3 Tainted: G L 6.4.0-rc6-next-20230614 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:skb_splice_from_iter+0x44a/0xb50 Code: 0f 45 f3 4c 89 74 24 08 e8 43 16 e5 fd 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 58 48 c7 00 00 00 00 00 c7 40 08 00 00 00 00 40 14 00 00 00 00 48 8b 84 24 60 01 00 00 65 48 2b 04 25 28 00 RSP: 0018:ffff88801bebf188 EFLAGS: 00000286 RAX: ffffed10037d7e42 RBX: 0000000000000000 RCX: ffffc90001ff3000 RDX: 0000000000040000 RSI: ffffffff8366effd RDI: ffff8880163f1ad8 RBP: 0000000008000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff8880163f1a00 R14: ffff8880163f1a00 R15: ffff88801bebf738 FS: 00007f7847333700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556166098 CR3: 00000000454a6000 CR4: 0000000000350ee0 Call Trace: __ip6_append_data.isra.0+0x1715/0x4560 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: 0033:0x7f7849e20b19 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:00007f7847333188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f7849f341a0 RCX: 00007f7849e20b19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000007 RBP: 00007f7849e7af6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001a000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffda616f94f R14: 00007f7847333300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 19 c4 06 03 jmpq 0x306c41e 5: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) c: 00 00 e: 90 nop f: 90 nop 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: f3 0f 1e fa endbr64 22: 65 8b 05 bd 84 b7 7e mov %gs:0x7eb784bd(%rip),%eax # 0x7eb784e6 * 29: 89 c1 mov %eax,%ecx <-- trapping instruction 2b: 48 8b 34 24 mov (%rsp),%rsi 2f: 81 e1 00 01 00 00 and $0x100,%ecx 35: 65 48 8b 14 25 00 8b mov %gs:0x38b00,%rdx 3c: 03 00 3e: a9 .byte 0xa9