Hello, syzbot found the following issue on: HEAD commit: ff7afaeca1a1 Merge tag 'nfs-for-6.12-3' of git://git.linux.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12a28ea7980000 kernel config: https://syzkaller.appspot.com/x/.config?x=921b01cbfd887a9b dashboard link: https://syzkaller.appspot.com/bug?extid=693a483dd6ac06c62b09 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f852e4679ae1/disk-ff7afaec.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/781fa489dc47/vmlinux-ff7afaec.xz kernel image: https://storage.googleapis.com/syzbot-assets/ac3c851393ff/bzImage-ff7afaec.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+693a483dd6ac06c62b09@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (2 ticks this GP) idle=400c/1/0x4000000000000000 softirq=14106/14106 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4167/1:b..l rcu: (detected by 0, t=10502 jiffies, g=10753, q=1689 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5819 Comm: syz-executor Not tainted 6.12.0-rc6-syzkaller-00110-gff7afaeca1a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x86/0x290 mm/kasan/generic.c:189 Code: 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd 41 80 3b 00 <0f> 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 00 45 89 dc RSP: 0018:ffffc90000a18b10 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffffffff34be6de RCX: ffffffff8171b4b8 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff9a5f36f0 RBP: ffffffffffffffff R08: ffffffff9a5f36f3 R09: 1ffffffff34be6de R10: dffffc0000000000 R11: fffffbfff34be6de R12: dffffc0000000000 R13: 1ffff92000143174 R14: dffffc0000000001 R15: fffffbfff34be6df FS: 00005555612eb500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f003b843e1c CR3: 00000000349fe000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline] debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline] do_raw_spin_unlock+0x58/0x8b0 kernel/locking/spinlock_debug.c:141 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock_irqrestore+0x81/0x140 kernel/locking/spinlock.c:194 debug_object_deactivate+0x2d5/0x390 lib/debugobjects.c:778 debug_hrtimer_deactivate kernel/time/hrtimer.c:428 [inline] debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:484 __run_hrtimer kernel/time/hrtimer.c:1659 [inline] __hrtimer_run_queues+0x305/0xd50 kernel/time/hrtimer.c:1755 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:60 [inline] RIP: 0010:__unwind_start+0x55e/0x740 arch/x86/kernel/unwind_orc.c:758 Code: 80 3c 14 00 74 12 4c 89 ef e8 0e f9 b9 00 48 ba 00 00 00 00 00 fc ff df 48 3b 5c 24 10 77 3f 49 8b 45 00 48 3b 44 24 10 76 34 <48> 39 5c 24 08 76 2d 48 39 44 24 08 77 26 48 8b 44 24 20 80 3c 10 RSP: 0018:ffffc90003f0f7a0 EFLAGS: 00000202 RAX: ffffc90003f10000 RBX: ffffc90003f08000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffc90003f10000 RDI: ffffc90003f0f7a0 RBP: 1ffff920007e1f01 R08: ffffc90003f0f801 R09: 0000000000000000 R10: ffffc90003f0f800 R11: fffff520007e1f0c R12: 1ffff920007e1f02 R13: ffffc90003f0f810 R14: ffffc90003f0f800 R15: ffffc90003f0f808 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcd0/0xf00 mm/page_alloc.c:2638 __slab_free+0x31b/0x3d0 mm/slub.c:4490 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] kmalloc_array_noprof include/linux/slab.h:923 [inline] alloc_pipe_info+0x1ff/0x4d0 fs/pipe.c:815 get_pipe_inode fs/pipe.c:890 [inline] create_pipe_files+0x87/0x700 fs/pipe.c:922 __do_pipe_flags+0x48/0x2d0 fs/pipe.c:973 do_pipe2+0xd4/0x310 fs/pipe.c:1024 __do_sys_pipe2 fs/pipe.c:1042 [inline] __se_sys_pipe2 fs/pipe.c:1040 [inline] __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1040 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: 0033:0x7f003d97d469 Code: c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 31 f6 b8 25 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 07 c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff RSP: 002b:00007ffc2d92ef88 EFLAGS: 00000246 ORIG_RAX: 0000000000000125 RAX: ffffffffffffffda RBX: 00005555612ffaf0 RCX: 00007f003d97d469 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 00007ffc2d92ef98 RBP: 00007ffc2d92f560 R08: 0000000000000007 R09: 0000555561302c40 R10: ba233592f55bc4c5 R11: 0000000000000246 R12: 00007ffc2d92f3b0 R13: 0000555561302990 R14: 00007ffc2d92f0d0 R15: 0000555561305130 </TASK> task:kworker/u8:6 state:R running task stack:17432 pid:4167 tgid:4167 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6690 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7012 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0xdc/0x550 kernel/locking/lockdep.c:5796 Code: 08 0f 83 f4 02 00 00 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 68 dc 1b 90 be 08 00 00 00 e8 dc 36 8b 00 48 0f a3 1d 5c 94 ab 0e <73> 16 e8 3d 7f 0a 00 84 c0 75 0d 80 3d de 56 95 0e 00 0f 84 f9 02 RSP: 0018:ffffc9000d4579e0 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81704804 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901bdc68 RBP: ffffc9000d457b40 R08: ffffffff901bdc6f R09: 1ffffffff2037b8d R10: dffffc0000000000 R11: fffffbfff2037b8e R12: 1ffff92001a8af44 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g10753 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=4600 rcu: rcu_preempt kthread starved for 10502 jiffies! g10753 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:25920 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
