watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.0:4698] Modules linked in: irq event stamp: 107430 hardirqs last enabled at (107429): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (107430): [] sysvec_apic_timer_interrupt+0xf/0x90 softirqs last enabled at (107414): [] irq_exit_rcu+0x93/0xc0 softirqs last disabled at (107407): [] irq_exit_rcu+0x93/0xc0 CPU: 0 PID: 4698 Comm: syz-executor.0 Not tainted 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+0x32/0xb50 Code: f7 41 56 41 55 49 89 fd 41 54 55 53 48 bb 00 00 00 00 00 fc ff df 48 81 ec 68 01 00 00 48 8d 84 24 88 00 00 00 48 89 74 24 38 <48> c1 e8 03 48 89 54 24 18 48 89 44 24 58 48 01 d8 48 c7 84 24 88 RSP: 0018:ffff888040157188 EFLAGS: 00000296 RAX: ffff888040157210 RBX: dffffc0000000000 RCX: 0000000000000cc0 RDX: 0000000000000001 RSI: ffff888040157738 RDI: ffff88800f24fb40 RBP: 0000000008000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000008000000 R11: 0000000000000001 R12: 0000000000000001 R13: ffff88800f24fb40 R14: ffff88800f24fb40 R15: ffff888040157738 FS: 00007fb81dfff700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2be2c000 CR3: 000000003e46a000 CR4: 0000000000350ef0 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: 0033:0x7fb820aaab19 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:00007fb81dfff188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fb820bbe020 RCX: 00007fb820aaab19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006 RBP: 00007fb820b04f6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001a000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe4c6e5aaf R14: 00007fb81dfff300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4700 Comm: syz-executor.5 Not tainted 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:__ip6_append_data.isra.0+0xb38/0x4560 Code: c4 88 fd 49 29 ef 31 ff 01 5c 24 40 4c 89 fe e8 ae c0 88 fd 4d 85 ff 0f 84 f6 11 00 00 e8 d0 c4 88 fd 48 8b 44 24 50 0f b6 00 <38> 44 24 5c 7c 08 84 c0 0f 85 a5 2f 00 00 48 8b 6c 24 10 8b 74 24 RSP: 0018:ffff8880103b7328 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90008401000 RDX: 0000000000040000 RSI: ffffffff83c34170 RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff88803d9b8140 R15: 0000000000000001 FS: 00007f6d1b4f9700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c72c000 CR3: 000000003e08c000 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: 0033:0x7f6d1dfa4b19 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:00007f6d1b4f9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f6d1e0b8020 RCX: 00007f6d1dfa4b19 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006 RBP: 00007f6d1dffef6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000001a000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd1e18def R14: 00007f6d1b4f9300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: f7 41 56 41 55 49 89 testl $0x89495541,0x56(%rcx) 7: fd std 8: 41 54 push %r12 a: 55 push %rbp b: 53 push %rbx c: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 13: fc ff df 16: 48 81 ec 68 01 00 00 sub $0x168,%rsp 1d: 48 8d 84 24 88 00 00 lea 0x88(%rsp),%rax 24: 00 25: 48 89 74 24 38 mov %rsi,0x38(%rsp) * 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction 2e: 48 89 54 24 18 mov %rdx,0x18(%rsp) 33: 48 89 44 24 58 mov %rax,0x58(%rsp) 38: 48 01 d8 add %rbx,%rax 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: 84 24 88 test %ah,(%rax,%rcx,4)