watchdog: BUG: soft lockup - CPU#0 stuck for 121s! [syz.8.46:6397] Modules linked in: irq event stamp: 10495541 hardirqs last enabled at (10495540): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (10495541): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (9458350): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (9458350): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (9458350): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (9458353): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (9458353): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (9458353): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6397 Comm: syz.8.46 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:depot_fetch_stack+0x3b/0xc0 lib/stackdepot.c:456 Code: ff ff 01 00 ff cd 83 3d d2 a8 ac 0a 00 74 16 48 c7 c7 c8 14 8e 8e be ff ff ff ff e8 7f 1c 78 06 83 f8 01 74 32 44 39 f5 73 36 <41> 89 ee 81 fd 00 20 00 00 73 5c 4a 8b 04 f5 c0 a8 dd 99 48 85 c0 RSP: 0018:ffffc90000007360 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000001320001 RCX: faabf9351c0b8000 RDX: 0000000000000100 RSI: ffffffff8db83c98 RDI: ffffffff8be28c00 RBP: 0000000000000000 R08: ffffc90000006f17 R09: 0000000000000000 R10: ffffc90000006f08 R11: fffff52000000de3 R12: 0000000001320001 R13: 0000000000000004 R14: 0000000000000338 R15: ffff888026c9da00 FS: 00007f079d0166c0(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7b5782ab8 CR3: 00000000788aa000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: inc_stack_record_count mm/page_owner.c:197 [inline] __set_page_owner+0x141/0x4a0 mm/page_owner.c:333 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] kmem_cache_alloc_node_noprof+0x280/0x3c0 mm/slub.c:4249 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:579 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1336 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4036 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7109 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 3d 22 f6 e8 c6 10 59 f6 fb bf 01 00 00 00 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90002e97500 EFLAGS: 00000286 RAX: faabf9351c0b8000 RBX: 0000000000000000 RCX: faabf9351c0b8000 RDX: 0000000000000007 RSI: ffffffff8d996215 RDI: 0000000000000001 RBP: ffffc90002e975b0 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade R10: dffffc0000000000 R11: fffffbfff1f43adf R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920005d2ea0 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x180/0x360 kernel/locking/lockdep.c:5875 Code: 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 9b 93 01 11 48 3b 44 24 58 0f 85 f2 00 00 00 <48> 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d e9 fd 16 d2 09 cc 65 8b RSP: 0018:ffffc90002e97678 EFLAGS: 00000246 RAX: faabf9351c0b8000 RBX: 0000000000000000 RCX: faabf9351c0b8000 RDX: 0000000000000000 RSI: ffffffff8db83c98 RDI: ffffffff8be28c00 RBP: ffffffff8172aae5 R08: 0000000000000000 R09: ffffffff8172aae5 R10: ffffc90002e97348 R11: ffffffff81ad0050 R12: 0000000000000002 R13: ffffffff8e13f0e0 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 discard_slab mm/slub.c:2717 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3186 put_cpu_partial+0x17c/0x250 mm/slub.c:3261 __slab_free+0x2f7/0x400 mm/slub.c:4513 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 lsm_inode_alloc security/security.c:755 [inline] security_inode_alloc+0x39/0x330 security/security.c:1697 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306 inode_init_always include/linux/fs.h:3281 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode_pseudo include/linux/fs.h:3364 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x12d/0x9f0 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socketpair+0x1c5/0x560 net/socket.c:1746 __do_sys_socketpair net/socket.c:1799 [inline] __se_sys_socketpair net/socket.c:1796 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1796 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f079c18e9a9 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:00007f079d016038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f079c3b5fa0 RCX: 00007f079c18e9a9 RDX: 0000000000000000 RSI: 0020000000000001 RDI: 0000000000000001 RBP: 00007f079c210ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f079c3b5fa0 R15: 00007ffc441dac68 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5218 Comm: udevd Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xf6e/0x12d0 kernel/smp.c:885 Code: 89 ee 83 e6 01 31 ff e8 a0 6e 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 4b 6a 0b 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 30 6a 0b 00 eb e5 44 89 RSP: 0018:ffffc90002f87560 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b873b1c0 RCX: ffff88805a9d9e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002f876c0 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade R10: dffffc0000000000 R11: fffffbfff1f43adf R12: 1ffff110170c8385 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8641c28 FS: 00007f4c6a40a880(0000) GS:ffff888125d23000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc143409c0 CR3: 0000000034198000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451 dup_mmap+0x15a0/0x1ac0 mm/mmap.c:1877 dup_mm kernel/fork.c:1477 [inline] copy_mm+0x13c/0x4b0 kernel/fork.c:1529 copy_process+0x16d3/0x3b80 kernel/fork.c:2169 kernel_clone+0x21e/0x870 kernel/fork.c:2599 __do_sys_clone kernel/fork.c:2742 [inline] __se_sys_clone kernel/fork.c:2726 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4c69cf1636 Code: 89 df e8 6d e8 f6 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 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffeaeb712b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffeaeb712b8 RCX: 00007f4c69cf1636 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000562979603910 R08: 0000000000000000 R09: 000056297960b900 R10: 00007f4c6a40ab50 R11: 0000000000000246 R12: 00007ffeaeb71670 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000