watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz-executor:9239] Modules linked in: irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [] copy_process+0x288a/0x7ff0 kernel/fork.c:2233 softirqs last enabled at (0): [] copy_process+0x28de/0x7ff0 kernel/fork.c:2234 softirqs last disabled at (0): [<0000000000000000>] 0x0 CPU: 1 UID: 0 PID: 9239 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x58e/0x16c0 kernel/smp.c:892 Code: 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 a9 95 0c 00 f3 90 41 0f b6 45 00 <41> 38 c4 7c 08 84 c0 0f 85 2c 0f 00 00 8b 45 08 31 ff 83 e0 01 41 RSP: 0018:ffffc90004a5f618 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fcc87d RDX: ffff8880332c8000 RSI: ffffffff81fcc857 RDI: ffff8880332c8000 RBP: ffff8880b8443360 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed101708866d R14: 0000000000000001 R15: ffff8880b853c840 FS: 000055555ed01500(0000) GS:ffff8881243ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fed393eb078 CR3: 0000000075b67000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000008004 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451 dup_mmap+0x1307/0x21b0 mm/mmap.c:1905 dup_mm kernel/fork.c:1538 [inline] copy_mm kernel/fork.c:1590 [inline] copy_process+0x4588/0x7ff0 kernel/fork.c:2288 kernel_clone+0x176/0x9d0 kernel/fork.c:2746 __do_sys_clone+0xd9/0x120 kernel/fork.c:2887 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b01dc58d2 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffdfdaeef90 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffdfdaeef90 RCX: 00007f9b01dc58d2 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffdfdaef11c R08: 0000000000000000 R09: 0000000000000001 R10: 000055555ed017d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 00000000001ab72b R15: 00007ffdfdaef170 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 16224 Comm: syz.2.11480 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:num_possible_cpus include/linux/cpumask.h:1224 [inline] RIP: 0010:mm_get_cid kernel/sched/sched.h:3934 [inline] RIP: 0010:sched_mm_cid_fork+0x51f/0xeb0 kernel/sched/core.c:10987 Code: ee 03 4c 89 6c 24 20 48 b8 00 00 00 00 00 fc ff df 49 01 c6 4c 89 f5 eb 5a 49 c7 c6 ac b0 20 8e 41 83 e6 07 41 83 c6 03 f3 90 <0f> b6 45 00 41 38 c6 7c 08 84 c0 0f 85 23 07 00 00 8b 35 76 65 4b RSP: 0018:ffffc90003b67c50 EFLAGS: 00000046 RAX: 0000000000000002 RBX: ffff88813fe93250 RCX: 0000000000000001 RDX: 0000000000000002 RSI: 0000000000000002 RDI: ffff88813fe93250 RBP: fffffbfff1c41615 R08: 0000000000000000 R09: fffff5200076cf7c R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000002 R14: 0000000000000007 R15: ffff888078f48000 FS: 00007f838bfb56c0(0000) GS:ffff8881242ef000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32622ff8 CR3: 000000008b298000 CR4: 0000000000350ef0 Call Trace: bprm_execve fs/exec.c:1801 [inline] bprm_execve+0x53f/0x1730 fs/exec.c:1754 do_execveat_common.isra.0+0x4a5/0x580 fs/exec.c:1876 __do_sys_execveat fs/exec.c:1960 [inline] __se_sys_execveat fs/exec.c:1953 [inline] __x64_sys_execveat+0xdf/0x130 fs/exec.c:1953 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f838b19ce59 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:00007f838bfb5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142 RAX: ffffffffffffffda RBX: 00007f838b415fa0 RCX: 00007f838b19ce59 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004 RBP: 00007f838b232e6f R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f838b416038 R14: 00007f838b415fa0 R15: 00007ffcaaa99128