watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.5.78:802]
CPU#0 Utilization every 22s during lockup:
#1: 100% system, 0% softirq, 1% hardirq, 0% idle
#2: 100% system, 0% softirq, 1% hardirq, 0% idle
#3: 100% system, 1% softirq, 1% hardirq, 0% idle
#4: 100% system, 0% softirq, 1% hardirq, 0% idle
#5: 100% system, 0% softirq, 1% hardirq, 0% idle
Modules linked in:
CPU: 0 UID: 0 PID: 802 Comm: syz.5.78 Not tainted 6.12.30-syzkaller #0 e83c0871284135f6aa48dc6945c75528bbbc4db7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:do_make_slave fs/pnode.c:101 [inline]
RIP: 0010:change_mnt_propagation+0xff/0xb00 fs/pnode.c:128
Code: a9 e8 ff 4d 8b 2e 48 c7 c3 48 ff ff ff 4d 89 fc 4d 8d 74 24 20 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 f7 e8 17 a9 e8 ff 4d 39 2e 0f 84 8f 00 00 00 49 81 c4
RSP: 0018:ffffc9000266f9e0 EFLAGS: 00000246
RAX: 1ffff11023319edc RBX: ffffffffffffff48 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000040000 RDI: 0000000000100000
RBP: ffffc9000266fa30 R08: ffff88812a1a010f R09: 0000000000000000
R10: ffff88812a1a0100 R11: ffffed1025434022 R12: ffff8881198cf6c0
R13: ffff8881113c6600 R14: ffff8881198cf6e0 R15: ffff8881301bd500
FS: 00007fa86e1bd6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa86e1ddf98 CR3: 000000010c7e8000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
umount_tree+0xdd9/0xf50 fs/namespace.c:1806
attach_recursive_mnt+0x540/0x1990 fs/namespace.c:2547
graft_tree+0x157/0x1c0 fs/namespace.c:2682
do_loopback+0x364/0x4b0 fs/namespace.c:2797
path_mount+0x57e/0xfe0 fs/namespace.c:3837
do_mount fs/namespace.c:3856 [inline]
__do_sys_mount fs/namespace.c:4066 [inline]
__se_sys_mount+0x306/0x3f0 fs/namespace.c:4043
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4043
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa86e78e9a9
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:00007fa86e1bd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa86e9b6320 RCX: 00007fa86e78e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007fa86e810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fa86e9b6320 R15: 00007ffdf2bbeb88
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 195 Comm: crond Not tainted 6.12.30-syzkaller #0 e83c0871284135f6aa48dc6945c75528bbbc4db7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:227 [inline]
RIP: 0010:path_init+0x1f0/0x12a0 fs/namei.c:2458
Code: 31 ff e8 23 bf 9f ff 44 89 f0 83 e0 01 4c 89 65 a8 75 0a 4d 89 ec e8 cf ba 9f ff eb 5a 48 c7 c3 00 d6 c0 86 48 c1 eb 03 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 14 44 8b 35 97
RSP: 0018:ffffc90001177840 EFLAGS: 00000293
RAX: ffffffff81d7a374 RBX: 1ffffffff0d81ac0 RCX: ffff88811f250000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900011778e8 R08: ffffc900011779cf R09: 0000000000000000
R10: ffffc900011779c0 R11: fffff5200022ef3a R12: ffffc900011779fc
R13: ffff88823fee3020 R14: 00000000007ae987 R15: ffffc900011779c0
FS: 00007ff91a0cac80(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0009f7010 CR3: 000000011e58c000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
path_lookupat+0x2b/0x4a0 fs/namei.c:2570
filename_lookup+0x1f5/0x520 fs/namei.c:2609
vfs_statx+0x101/0x200 fs/stat.c:312
vfs_fstatat+0xe5/0x1d0 fs/stat.c:341
__do_sys_newfstatat fs/stat.c:505 [inline]
__se_sys_newfstatat+0xcd/0x340 fs/stat.c:499
__x64_sys_newfstatat+0x9f/0xc0 fs/stat.c:499
x64_sys_call+0x1821/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:263
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff91a284b0a
Code: 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 b9 f2 0d 00 f7
RSP: 002b:00007ffd8155bec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ff91a434490 RCX: 00007ff91a284b0a
RDX: 00007ffd8155bee8 RSI: 00007ff91a40d7e8 RDI: 00000000ffffff9c
RBP: 00000000687c9b34 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000003c R14: 0000000000000000 R15: 0000000000000039