syzbot


possible deadlock in smc_switch_to_fallback (2)

Status: upstream: reported on 2024/06/24 15:15
Subsystems: net s390
[Documentation on labels]
Reported-by: syzbot+bef85a6996d1737c1a2f@syzkaller.appspotmail.com
First crash: 22d, last: 11h37m
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [net?] [s390?] possible deadlock in smc_switch_to_fallback (2) 0 (1) 2024/06/24 15:15
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in smc_switch_to_fallback net s390 43575 946d 966d 20/27 fixed on 2022/03/08 16:11

Sample crash report:
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc6-syzkaller-01414-g58f9416d413a #0 Not tainted
------------------------------------------------------
syz.2.311/18436 is trying to acquire lock:
ffff88806a450a50 (&smc->clcsock_release_lock){+.+.}-{3:3}, at: smc_switch_to_fallback+0x35/0xd00 net/smc/af_smc.c:902

but task is already holding lock:
ffff88806a450258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline]
ffff88806a450258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2773

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (sk_lock-AF_INET){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       lock_sock_nested+0x48/0x100 net/core/sock.c:3543
       do_ip_setsockopt+0x1a2d/0x3cd0 net/ipv4/ip_sockglue.c:1078
       ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
       do_sock_setsockopt+0x3af/0x720 net/socket.c:2312
       __sys_setsockopt+0x1ae/0x250 net/socket.c:2335
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2341
       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 (rtnl_mutex){+.+.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       do_ip_setsockopt+0x127d/0x3cd0 net/ipv4/ip_sockglue.c:1077
       ip_setsockopt+0x63/0x100 net/ipv4/ip_sockglue.c:1417
       smc_setsockopt+0x275/0xe50 net/smc/af_smc.c:3072
       do_sock_setsockopt+0x3af/0x720 net/socket.c:2312
       __sys_setsockopt+0x1ae/0x250 net/socket.c:2335
       __do_sys_setsockopt net/socket.c:2344 [inline]
       __se_sys_setsockopt net/socket.c:2341 [inline]
       __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2341
       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 (&smc->clcsock_release_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       smc_switch_to_fallback+0x35/0xd00 net/smc/af_smc.c:902
       smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2779
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg+0x221/0x270 net/socket.c:745
       ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585
       ___sys_sendmsg net/socket.c:2639 [inline]
       __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2668
       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:
  &smc->clcsock_release_lock --> rtnl_mutex --> sk_lock-AF_INET

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

1 lock held by syz.2.311/18436:
 #0: ffff88806a450258 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1607 [inline]
 #0: ffff88806a450258 (sk_lock-AF_INET){+.+.}-{0:0}, at: smc_sendmsg+0x55/0x530 net/smc/af_smc.c:2773

stack backtrace:
CPU: 1 PID: 18436 Comm: syz.2.311 Not tainted 6.10.0-rc6-syzkaller-01414-g58f9416d413a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 smc_switch_to_fallback+0x35/0xd00 net/smc/af_smc.c:902
 smc_sendmsg+0x11f/0x530 net/smc/af_smc.c:2779
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2585
 ___sys_sendmsg net/socket.c:2639 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2668
 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: 0033:0x7f4d08775bd9
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:00007f4d0950f048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4d08904038 RCX: 00007f4d08775bd9
RDX: 0000000020000001 RSI: 00000000200003c0 RDI: 0000000000000003
RBP: 00007f4d087e4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4d08904038 R15: 00007ffc11f60c58
 </TASK>

Crashes (125):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/12 23:43 net-next 58f9416d413a eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/12 17:16 net-next 58f9416d413a eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/12 11:53 net-next 58f9416d413a eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/12 10:31 net-next 58f9416d413a eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/12 08:17 net-next 58f9416d413a eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/11 22:41 net-next 58f9416d413a c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/11 17:30 net-next 58f9416d413a c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/10 19:43 net-next 40ab9e0dc865 e7213be3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/09 12:03 net-next e0ee68a8bef9 bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/09 03:08 net-next e0ee68a8bef9 bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 23:25 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 21:19 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 20:07 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 19:43 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 15:40 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 13:00 net-next 3abbd7ed8b76 cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 07:34 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 06:33 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 04:58 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 03:28 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 02:24 net-next 2f5e6395714d 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-net-next-test-gce possible deadlock in smc_switch_to_fallback
2024/07/08 01:46 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/08 00:07 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 23:05 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 22:04 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 20:14 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 19:00 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 17:58 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 15:56 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 14:49 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 13:25 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 12:23 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 10:57 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 09:23 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 08:07 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 06:41 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 03:38 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 03:16 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 02:55 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 02:40 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 02:37 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 00:42 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/07 00:12 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/06 23:52 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/06 18:00 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/06 17:56 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/06 17:52 net-next 2f5e6395714d bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/06/24 13:42 net-next 568ebdaba637 edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/06/21 05:58 net-next a6ec08beec9e dac2aa43 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce possible deadlock in smc_switch_to_fallback
2024/07/09 02:04 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root possible deadlock in smc_switch_to_fallback
* Struck through repros no longer work on HEAD.