syzbot


possible deadlock in do_ip_getsockopt (3)

Status: upstream: reported on 2024/07/10 21:17
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+aa5e39930997b0fe3dba@syzkaller.appspotmail.com
First crash: 223d, last: 6h53m
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] possible deadlock in do_ip_getsockopt (3) 0 (1) 2024/07/10 21:17
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in do_ip_getsockopt netfilter 22 2569d 2574d 4/28 fixed on 2018/02/04 23:45
android-49 possible deadlock in do_ip_getsockopt 4 2416d 2452d 0/3 auto-closed as invalid on 2019/02/22 14:29
upstream possible deadlock in do_ip_getsockopt (2) netfilter 206 2547d 2562d 4/28 fixed on 2018/02/26 20:04

Sample crash report:
======================================================
WARNING: possible circular locking dependency detected
6.14.0-rc2-syzkaller #0 Not tainted
------------------------------------------------------
syz.9.1297/12548 is trying to acquire lock:
ffffffff8fcc0b48 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702

but task is already holding lock:
ffff88805880a1a8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_getsockopt+0x144/0x3e0 net/smc/af_smc.c:3153

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&smc->clcsock_release_lock){+.+.}-{4:4}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
       smc_switch_to_fallback+0x35/0xd90 net/smc/af_smc.c:903
       smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2781
       sock_sendmsg_nosec net/socket.c:718 [inline]
       __sock_sendmsg+0x223/0x270 net/socket.c:733
       __sys_sendto+0x363/0x4c0 net/socket.c:2187
       __do_sys_sendto net/socket.c:2194 [inline]
       __se_sys_sendto net/socket.c:2190 [inline]
       __x64_sys_sendto+0xde/0x100 net/socket.c:2190
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       lock_sock_nested+0x48/0x100 net/core/sock.c:3645
       do_ip_setsockopt+0x1a2d/0x3cd0 net/ipv4/ip_sockglue.c:1078
       ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
       do_sock_setsockopt+0x3b1/0x720 net/socket.c:2303
       __sys_setsockopt net/socket.c:2328 [inline]
       __do_sys_setsockopt net/socket.c:2334 [inline]
       __se_sys_setsockopt net/socket.c:2331 [inline]
       __x64_sys_setsockopt+0x1ee/0x280 net/socket.c:2331
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (rtnl_mutex){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3163 [inline]
       check_prevs_add kernel/locking/lockdep.c:3282 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
       do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702
       ip_getsockopt+0xed/0x2e0 net/ipv4/ip_sockglue.c:1765
       tcp_getsockopt+0x165/0x1c0 net/ipv4/tcp.c:4671
       smc_getsockopt+0x1db/0x3e0 net/smc/af_smc.c:3163
       do_sock_getsockopt+0x3c6/0x7e0 net/socket.c:2364
       __sys_getsockopt net/socket.c:2393 [inline]
       __do_sys_getsockopt net/socket.c:2400 [inline]
       __se_sys_getsockopt net/socket.c:2397 [inline]
       __x64_sys_getsockopt+0x2a1/0x370 net/socket.c:2397
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  rtnl_mutex --> sk_lock-AF_INET --> &smc->clcsock_release_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&smc->clcsock_release_lock);
                               lock(sk_lock-AF_INET);
                               lock(&smc->clcsock_release_lock);
  lock(rtnl_mutex);

 *** DEADLOCK ***

1 lock held by syz.9.1297/12548:
 #0: ffff88805880a1a8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_getsockopt+0x144/0x3e0 net/smc/af_smc.c:3153

stack backtrace:
CPU: 1 UID: 0 PID: 12548 Comm: syz.9.1297 Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
 check_prev_add kernel/locking/lockdep.c:3163 [inline]
 check_prevs_add kernel/locking/lockdep.c:3282 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
 do_ip_getsockopt+0x10f5/0x2940 net/ipv4/ip_sockglue.c:1702
 ip_getsockopt+0xed/0x2e0 net/ipv4/ip_sockglue.c:1765
 tcp_getsockopt+0x165/0x1c0 net/ipv4/tcp.c:4671
 smc_getsockopt+0x1db/0x3e0 net/smc/af_smc.c:3163
 do_sock_getsockopt+0x3c6/0x7e0 net/socket.c:2364
 __sys_getsockopt net/socket.c:2393 [inline]
 __do_sys_getsockopt net/socket.c:2400 [inline]
 __se_sys_getsockopt net/socket.c:2397 [inline]
 __x64_sys_getsockopt+0x2a1/0x370 net/socket.c:2397
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e8578cde9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e86524038 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007f8e859a5fa0 RCX: 00007f8e8578cde9
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f8e8580e2a0 R08: 00004000000000c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8e859a5fa0 R15: 00007ffc14e2f8c8
 </TASK>

Crashes (915):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/10 04:19 upstream a64dcfb451e2 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/01/16 05:17 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root possible deadlock in do_ip_getsockopt
2025/01/16 03:23 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/06 01:12 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto possible deadlock in do_ip_getsockopt
2025/01/05 22:04 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root possible deadlock in do_ip_getsockopt
2024/12/15 15:51 upstream 2d8308bf5b67 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root possible deadlock in do_ip_getsockopt
2024/11/13 11:10 upstream 3022e9d00ebe 62026c85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/02/03 04:35 upstream 69e858e0b8b2 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in do_ip_getsockopt
2025/01/31 23:50 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 possible deadlock in do_ip_getsockopt
2024/11/06 13:18 upstream 2e1b3cc9d7f7 7b852900 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream possible deadlock in do_ip_getsockopt
2025/02/13 04:43 upstream 4dc1d1bec898 2afad16e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/10 06:30 upstream 69b54314c975 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/10 05:24 upstream 69b54314c975 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/09 21:37 upstream 69b54314c975 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/09 17:24 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/09 10:32 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 21:04 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 21:04 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 13:54 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 05:53 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 04:19 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/08 03:11 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/07 09:50 upstream bb066fe812d6 53657d1b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/06 20:48 upstream 92514ef226f5 1e1faf27 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/06 17:45 upstream 92514ef226f5 1e1faf27 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/06 05:43 upstream 92514ef226f5 577d049b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/06 04:28 upstream 92514ef226f5 577d049b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/06 03:05 upstream 92514ef226f5 577d049b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/05 22:57 upstream 92514ef226f5 577d049b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/05 11:56 upstream 5c8c229261f1 5896748e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/05 03:03 upstream d009de7d5428 44c01590 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/04 20:21 upstream d009de7d5428 44c01590 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/04 14:09 upstream 0de63bb7d919 8f267cef .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/04 07:29 upstream 0de63bb7d919 8f267cef .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/03 18:11 upstream 2014c95afece a21a8419 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/01 23:38 upstream 69e858e0b8b2 0dff8567 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/01 00:16 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/01/31 19:37 upstream 69e858e0b8b2 aa47157c .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 possible deadlock in do_ip_getsockopt
2025/02/11 12:26 net 9dfedb8dc78b 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/05 18:39 net a1300691aed9 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/05 04:08 net 4241a702e0d0 4baca3d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/03 15:29 net 235174b2bed8 a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/02 07:10 net 46ded7092323 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/02 02:24 net 46ded7092323 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/02 01:09 net c2933b2befe2 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 20:11 net c2933b2befe2 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 15:44 net c2933b2befe2 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 12:59 net c2933b2befe2 0dff8567 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 10:27 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 09:23 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 04:57 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/01 03:09 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/31 22:34 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/31 18:34 net c2933b2befe2 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/31 13:26 net dfffaccffc53 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/31 12:23 net dfffaccffc53 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/01/31 09:53 net dfffaccffc53 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/09 06:23 net-next acdefab0dcbc ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/05 10:24 net-next 135c3c86a7ce 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/02 09:52 net-next c2933b2befe2 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in do_ip_getsockopt
2025/02/14 19:08 linux-next 0ae0fa3bf0b4 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/02/14 16:43 linux-next 0ae0fa3bf0b4 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/02/05 14:53 linux-next ed88b8b82c53 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/02/05 13:11 linux-next ed88b8b82c53 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in do_ip_getsockopt
2024/07/06 21:07 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in do_ip_getsockopt
2025/01/19 01:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 1950a0af2d55 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 possible deadlock in do_ip_getsockopt
* Struck through repros no longer work on HEAD.