Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 14665 Comm: syz.2.2221 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:148 [inline] RIP: 0010:tcp_rcvbuf_grow net/ipv4/tcp_input.c:-1 [inline] RIP: 0010:tcp_rcv_space_adjust+0x401/0xba0 net/ipv4/tcp_input.c:988 Code: 41 29 ec 4d 0f af f4 4d 01 f6 4d 89 f5 89 e9 4c 89 e8 48 c1 e8 20 74 0d 4c 89 e8 31 d2 48 f7 f1 49 89 c4 eb 0a 44 89 e8 31 d2 f1 41 89 c4 4c 8d ab 38 09 00 00 4c 89 e8 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc9000206f6d0 EFLAGS: 00010246 RAX: 0000000000036640 RBX: ffff888056eec100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000017d7 RDI: 00000000000017d8 RBP: 0000000000000000 R08: ffffffff907a4b7f R09: 1ffffffff20f496f R10: dffffc0000000000 R11: fffffbfff20f4970 R12: 00000000000000ec R13: 0000000000036640 R14: 0000000000036640 R15: 00000000000001d8 FS: 00007f89998446c0(0000) GS:ffff888124dd7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f33e4e4ff64 CR3: 000000003345a000 CR4: 00000000003526f0 Call Trace: tcp_recvmsg_locked+0x2192/0x3770 net/ipv4/tcp.c:2881 tcp_recvmsg+0x203/0x7f0 net/ipv4/tcp.c:2945 sock_recvmsg_nosec net/socket.c:1153 [inline] sock_recvmsg+0x166/0x1e0 net/socket.c:1173 __sys_recvfrom+0x231/0x3a0 net/socket.c:2331 __do_sys_recvfrom net/socket.c:2346 [inline] __se_sys_recvfrom net/socket.c:2342 [inline] __x64_sys_recvfrom+0xde/0x100 net/socket.c:2342 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f899899e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8999844028 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffffda RBX: 00007f8998c25fa0 RCX: 00007f899899e0d9 RDX: fffffffffffffd0b RSI: 0000200000000080 RDI: 0000000000000004 RBP: 00007f8998a35024 R08: 0000000000000000 R09: fffffffffffffd25 R10: 00000000c9100120 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8998c26038 R14: 00007f8998c25fa0 R15: 00007ffd3e0cb068 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:148 [inline] RIP: 0010:tcp_rcvbuf_grow net/ipv4/tcp_input.c:-1 [inline] RIP: 0010:tcp_rcv_space_adjust+0x401/0xba0 net/ipv4/tcp_input.c:988 Code: 41 29 ec 4d 0f af f4 4d 01 f6 4d 89 f5 89 e9 4c 89 e8 48 c1 e8 20 74 0d 4c 89 e8 31 d2 48 f7 f1 49 89 c4 eb 0a 44 89 e8 31 d2 f1 41 89 c4 4c 8d ab 38 09 00 00 4c 89 e8 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc9000206f6d0 EFLAGS: 00010246 RAX: 0000000000036640 RBX: ffff888056eec100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000017d7 RDI: 00000000000017d8 RBP: 0000000000000000 R08: ffffffff907a4b7f R09: 1ffffffff20f496f R10: dffffc0000000000 R11: fffffbfff20f4970 R12: 00000000000000ec R13: 0000000000036640 R14: 0000000000036640 R15: 00000000000001d8 FS: 00007f89998446c0(0000) GS:ffff888124cd7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc7685b2e9c CR3: 000000003345a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 41 29 ec sub %ebp,%r12d 3: 4d 0f af f4 imul %r12,%r14 7: 4d 01 f6 add %r14,%r14 a: 4d 89 f5 mov %r14,%r13 d: 89 e9 mov %ebp,%ecx f: 4c 89 e8 mov %r13,%rax 12: 48 c1 e8 20 shr $0x20,%rax 16: 74 0d je 0x25 18: 4c 89 e8 mov %r13,%rax 1b: 31 d2 xor %edx,%edx 1d: 48 f7 f1 div %rcx 20: 49 89 c4 mov %rax,%r12 23: eb 0a jmp 0x2f 25: 44 89 e8 mov %r13d,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 f1 div %ecx <-- trapping instruction 2c: 41 89 c4 mov %eax,%r12d 2f: 4c 8d ab 38 09 00 00 lea 0x938(%rbx),%r13 36: 4c 89 e8 mov %r13,%rax 39: 48 c1 e8 03 shr $0x3,%rax 3d: 48 rex.W 3e: b9 .byte 0xb9