WARNING in tcp_recvmsg_locked

Status: upstream: reported C repro on 2024/04/04 07:11
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+f8668bc77ab1a2527c3f@syzkaller.appspotmail.com
First crash: 847d, last: 781d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/04/04 upstream (ToT) c85af715cac0 C [report] WARNING in tcp_recvmsg_locked
2026/07/06 upstream (ToT) 8cdeaa50eae8 C Failed due to an error; will retry later
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in tcp_recvmsg_locked net -1 1 1109d 1109d 0/29 auto-obsoleted due to no activity on 2023/11/06 08:49
upstream WARNING in tcp_recvmsg_locked (2) prio:normal net -1 syz, C done 13 9d05h 967d 0/29 upstream: reported C repro on 2023/12/05 17:53
▶ ▼ Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/07/25 04:45 2h20m bisect fix linux-6.1.y error job log
2024/06/09 03:53 2h17m bisect fix linux-6.1.y OK (0) job log log
2024/05/09 05:38 2h40m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
TCP recvmsg seq # bug 2: copied 98ABF81A, seq 98ABF7E2, rcvnxt 98ABF7E3, fl 40
WARNING: CPU: 0 PID: 4874 at net/ipv4/tcp.c:2530 tcp_recvmsg_locked+0x5a0/0x1ce4 net/ipv4/tcp.c:2528
Modules linked in:
CPU: 0 PID: 4874 Comm: syz-executor265 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : tcp_recvmsg_locked+0x5a0/0x1ce4 net/ipv4/tcp.c:2528
lr : tcp_recvmsg_locked+0x5a0/0x1ce4 net/ipv4/tcp.c:2528
sp : ffff80001e867220
x29: ffff80001e8673e0 x28: ffff0000c37420dc x27: ffff0000c3741a38
x26: ffff0000cf75f270 x25: ffff0000c3741a38 x24: 1fffe00019eebe53
x23: 0000000000000001 x22: 0000000098abf7e2 x21: 1fffe00019eebe54
x20: 0000000098abf81a x19: dfff800000000000 x18: 1fffe0003686b776
x17: ffff80001583d000 x16: ffff800008305ec4 x15: ffff0001b435bbbc
x14: 1ffff00002b080b0 x13: dfff800000000000 x12: 0000000000000003
x11: 0000000000ff0100 x10: 0000000000000003 x9 : 472be0453f6b0400
x8 : 472be0453f6b0400 x7 : ffff80000827c8d4 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff8000122ac6e0 x0 : ffff80019ebc9000
Call trace:
 tcp_recvmsg_locked+0x5a0/0x1ce4 net/ipv4/tcp.c:2528
 receive_fallback_to_copy net/ipv4/tcp.c:2025 [inline]
 tcp_zerocopy_receive+0x6a8/0x1ce8 net/ipv4/tcp.c:2232
 do_tcp_getsockopt+0x1b44/0x28d0 net/ipv4/tcp.c:4375
 tcp_getsockopt+0x6c/0xe8 net/ipv4/tcp.c:4445
 sock_common_getsockopt+0xa8/0xc4 net/core/sock.c:3651
 __sys_getsockopt+0x1e8/0x484 net/socket.c:2327
 __do_sys_getsockopt net/socket.c:2342 [inline]
 __se_sys_getsockopt net/socket.c:2339 [inline]
 __arm64_sys_getsockopt+0xb8/0xd4 net/socket.c:2339
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 1362
hardirqs last  enabled at (1361): [<ffff80000827c974>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (1361): [<ffff80000827c974>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5004
hardirqs last disabled at (1362): [<ffff800012151e8c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1354): [<ffff800008020d7c>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (1354): [<ffff800008020d7c>] __do_softirq+0xc1c/0xe38 kernel/softirq.c:600
softirqs last disabled at (1323): [<ffff80000802a99c>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
cleanup rbuf bug: copied 98ABF81A seq 98ABF7E3 rcvnxt 98ABF7E3
WARNING: CPU: 1 PID: 4874 at net/ipv4/tcp.c:1649 tcp_cleanup_rbuf net/ipv4/tcp.c:1647 [inline]
WARNING: CPU: 1 PID: 4874 at net/ipv4/tcp.c:1649 tcp_recvmsg_locked+0x19bc/0x1ce4 net/ipv4/tcp.c:2670
Modules linked in:
CPU: 1 PID: 4874 Comm: syz-executor265 Tainted: G        W          6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : tcp_cleanup_rbuf net/ipv4/tcp.c:1647 [inline]
pc : tcp_recvmsg_locked+0x19bc/0x1ce4 net/ipv4/tcp.c:2670
lr : tcp_cleanup_rbuf net/ipv4/tcp.c:1647 [inline]
lr : tcp_recvmsg_locked+0x19bc/0x1ce4 net/ipv4/tcp.c:2670
sp : ffff80001e867220
x29: ffff80001e8673e0 x28: ffff700003d0ce6c x27: ffff0000c3741a38
x26: ffff0000c3741880 x25: ffffffffffffffc9 x24: 0000000000000000
x23: 0000000000000001 x22: 0000000000000037 x21: 0000000098abf7e3
x20: 0000000098abf81a x19: dfff800000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008305ec4 x15: 0000000000000000
x14: 1ffff00002b080b0 x13: dfff800000000000 x12: 0000000000000001
x11: 1fffe0001b213910 x10: 0000000000000000 x9 : 472be0453f6b0400
x8 : 472be0453f6b0400 x7 : ffff80000827c8d4 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff80000826a620
x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 tcp_cleanup_rbuf net/ipv4/tcp.c:1647 [inline]
 tcp_recvmsg_locked+0x19bc/0x1ce4 net/ipv4/tcp.c:2670
 receive_fallback_to_copy net/ipv4/tcp.c:2025 [inline]
 tcp_zerocopy_receive+0x6a8/0x1ce8 net/ipv4/tcp.c:2232
 do_tcp_getsockopt+0x1b44/0x28d0 net/ipv4/tcp.c:4375
 tcp_getsockopt+0x6c/0xe8 net/ipv4/tcp.c:4445
 sock_common_getsockopt+0xa8/0xc4 net/core/sock.c:3651
 __sys_getsockopt+0x1e8/0x484 net/socket.c:2327
 __do_sys_getsockopt net/socket.c:2342 [inline]
 __se_sys_getsockopt net/socket.c:2339 [inline]
 __arm64_sys_getsockopt+0xb8/0xd4 net/socket.c:2339
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 1630
hardirqs last  enabled at (1629): [<ffff80000827c974>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1366 [inline]
hardirqs last  enabled at (1629): [<ffff80000827c974>] finish_lock_switch+0xbc/0x1e8 kernel/sched/core.c:5004
hardirqs last disabled at (1630): [<ffff800012151e8c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (1600): [<ffff800008020d7c>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (1600): [<ffff800008020d7c>] __do_softirq+0xc1c/0xe38 kernel/softirq.c:600
softirqs last disabled at (1365): [<ffff80000802a99c>] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/04 07:11 linux-6.1.y 347385861c50 51c4dcff .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in tcp_recvmsg_locked
* Struck through repros no longer work on HEAD.