watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.1.421:2105]
Modules linked in:
CPU: 0 PID: 2105 Comm: syz.1.421 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x10d/0x560 kernel/softirq.c:571
Code: 08 85 e8 36 45 6f 03 65 66 c7 05 2c 40 c4 7e 00 00 48 c7 c7 60 2c 08 85 e8 20 45 6f 03 65 44 89 35 30 42 c3 7e fb 44 89 75 a4 <b8> ff ff ff ff 0f bc 45 a4 41 89 c5 41 ff c5 0f 85 c0 00 00 00 48
RSP: 0018:ffffc90000007f38 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff88811b830280 RCX: 4452f7bf1e82c400
RDX: 1ffffffff0e18a00 RSI: ffffffff85082c60 RDI: ffffffff85638440
RBP: ffffc90000007fc0 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000280 R15: 000000000000000a
FS:  00007f72387756c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7239dcf7d9 CR3: 0000000114708000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__thunk_restore+0xb/0x1c arch/x86/entry/thunk_64.S:47
Code: e8 b6 38 b2 03 eb 18 55 48 89 e5 57 56 52 51 50 41 50 41 51 41 52 41 53 e8 5e 3a b2 03 eb 00 41 5b 41 5a 41 59 41 58 58 59 5a <5e> 5f 5d c3 00 00 00 cc cc 00 00 cc cc 00 00 cc cc 55 48 89 e5 81
RSP: 0018:ffffc900026c7688 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff920004d8ee0 RCX: 0000000000000000
RDX: ffff88811edba500 RSI: 0000000000000008 RDI: ffff88811b833b40
RBP: ffffc900026c7698 R08: 0000000000000800 R09: ffff88823fec0000
R10: 000000009d60f4ef R11: 000000002324ea07 R12: 0000000000000020
R13: ffff88810024c000 R14: ffff88810024cfe8 R15: ffff88810024cfe8
 __raw_write_unlock_irq include/linux/rwlock_api_smp.h:268 [inline]
 _raw_write_unlock_irq+0x3f/0x60 kernel/locking/spinlock.c:348
 netlink_table_ungrab net/netlink/af_netlink.c:441 [inline]
 __netlink_kernel_create+0x808/0x950 net/netlink/af_netlink.c:2095
 netlink_kernel_create include/linux/netlink.h:62 [inline]
 genl_pernet_init+0xb6/0x170 net/netlink/genetlink.c:1399
 ops_init+0x2c0/0x470 net/core/net_namespace.c:138
 setup_net+0x331/0xa30 net/core/net_namespace.c:332
 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:476
 create_new_namespaces+0x3a8/0x660 kernel/nsproxy.c:110
 copy_namespaces+0x1cc/0x220 kernel/nsproxy.c:178
 copy_process+0x11b5/0x3280 kernel/fork.c:2356
 kernel_clone+0x233/0x960 kernel/fork.c:2742
 __do_sys_clone kernel/fork.c:2868 [inline]
 __se_sys_clone kernel/fork.c:2852 [inline]
 __x64_sys_clone+0x198/0x210 kernel/fork.c:2852
 x64_sys_call+0x41f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7239d1c159
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:00007f7238774fd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f7239fa3fa0 RCX: 00007f7239d1c159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0126080
RBP: 00007f7239db3024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f7239fa4038 R14: 00007f7239fa3fa0 R15: 00007ffd9bce9778
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729