Hello, syzbot found the following issue on: HEAD commit: 100ceb4817a2 Merge tag 'vfs-6.14-rc1.mount.v2' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13afa824580000 kernel config: https://syzkaller.appspot.com/x/.config?x=88da85736adb8c92 dashboard link: https://syzkaller.appspot.com/bug?extid=21889604e13b9172a50b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=104509f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1a2911ef47f9/disk-100ceb48.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/17629e04715c/vmlinux-100ceb48.xz kernel image: https://storage.googleapis.com/syzbot-assets/26f2225b0be5/bzImage-100ceb48.xz The issue was bisected to: commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 Author: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx> Date: Sat Sep 29 00:59:43 2018 +0000 tc: Add support for configuring the taprio scheduler bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15358ab0580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17358ab0580000 console output: https://syzkaller.appspot.com/x/log.txt?x=13358ab0580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+21889604e13b9172a50b@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler") rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (3 ticks this GP) idle=160c/1/0x4000000000000000 softirq=14358/14358 fqs=1 rcu: (detected by 0, t=12604 jiffies, g=9565, q=1150 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6070 Comm: syz-executor Not tainted 6.13.0-syzkaller-00164-g100ceb4817a2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:mark_usage kernel/locking/lockdep.c:4616 [inline] RIP: 0010:__lock_acquire+0xb2a/0x2100 kernel/locking/lockdep.c:5180 Code: 24 48 c7 c0 14 32 1a 90 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 fc 11 00 00 83 3d 05 6b 9f 0e 00 0f 84 17 09 00 00 83 7c 24 58 00 <48> 8b 6c 24 38 0f 84 f9 00 00 00 48 8b 5c 24 18 0f b6 04 13 84 c0 RSP: 0018:ffffc90000a188f0 EFLAGS: 00000002 RAX: 0000000000000002 RBX: ffffffff93c30ebe RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff942b3888 RBP: 0000000000000002 R08: ffffffff942b388f R09: 1ffffffff2856711 R10: dffffc0000000000 R11: fffffbfff2856712 R12: ffff88802568a8c4 R13: ffff888025689e00 R14: 0000000000000005 R15: ffff88802568a9c8 FS: 000055557e8ff500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f57424a56e8 CR3: 000000005a2f0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_activate+0x17f/0x580 lib/debugobjects.c:818 debug_hrtimer_activate kernel/time/hrtimer.c:428 [inline] debug_activate kernel/time/hrtimer.c:469 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1076 __run_hrtimer kernel/time/hrtimer.c:1756 [inline] __hrtimer_run_queues+0x6cb/0xd30 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 5a 0a ae f5 48 89 df e8 92 51 af f5 e8 cd 6c da f5 fb bf 01 00 00 00 <e8> 62 c4 a0 f5 65 8b 05 83 03 37 74 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc900031272b0 EFLAGS: 00000282 RAX: ace9d390bb8c2800 RBX: ffff888028818370 RCX: ffffffff817b2e5a RDX: dffffc0000000000 RSI: ffffffff8c0a9940 RDI: 0000000000000001 RBP: ffffc90003127470 R08: ffffffff942b392f R09: 1ffffffff2856725 R10: dffffc0000000000 R11: fffffbfff2856726 R12: 000000000000000c R13: ffffc900031276d8 R14: ffff888072aa1680 R15: 1ffff92000624edb mark_inode_dirty include/linux/fs.h:2500 [inline] dquot_alloc_space include/linux/quotaops.h:319 [inline] dquot_alloc_block include/linux/quotaops.h:336 [inline] ext4_mb_new_blocks+0x2edb/0x4e00 fs/ext4/mballoc.c:6183 ext4_ext_map_blocks+0x1be0/0x7d30 fs/ext4/extents.c:4379 ext4_map_create_blocks fs/ext4/inode.c:516 [inline] ext4_map_blocks+0x8bf/0x1990 fs/ext4/inode.c:702 ext4_getblk+0x1fa/0x880 fs/ext4/inode.c:849 ext4_bread+0x2e/0x180 fs/ext4/inode.c:912 ext4_append+0x327/0x5c0 fs/ext4/namei.c:83 ext4_init_new_dir+0x33e/0xa30 fs/ext4/namei.c:2988 ext4_mkdir+0x4f7/0xcf0 fs/ext4/namei.c:3034 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311 do_mkdirat+0x264/0x3a0 fs/namei.c:4334 __do_sys_mkdir fs/namei.c:4354 [inline] __se_sys_mkdir fs/namei.c:4352 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4352 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: 0033:0x7f57417b9997 Code: 44 00 00 48 8d 50 ff 83 c1 01 48 21 d0 75 f4 01 cf 48 83 c6 08 4c 39 c6 75 d9 89 f8 c3 31 ff 89 f8 c3 90 b8 53 00 00 00 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:00007fff05fbbfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff05fbc132 RCX: 00007f57417b9997 RDX: 0000000011487a76 RSI: 00000000000001c0 RDI: 00007fff05fbc120 RBP: f49998db0aa753ff R08: 0000000000000004 R09: 0000000000000001 R10: 00007f57424cb038 R11: 0000000000000246 R12: 8421084210842109 R13: 00007fff05fbc132 R14: 00007f574183aca0 R15: 0000000011487a76 </TASK> rcu: rcu_preempt kthread starved for 10869 jiffies! g9565 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:R running task stack:26264 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 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> rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.13.0-syzkaller-00164-g100ceb4817a2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events_power_efficient gc_worker RIP: 0010:seqcount_lockdep_reader_access+0x1e0/0x220 include/linux/seqlock.h:75 Code: f7 4d 85 ed 75 16 e8 6f 61 be f7 eb 15 e8 68 61 be f7 e8 23 ec e8 01 4d 85 ed 74 ea e8 59 61 be f7 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00 RSP: 0018:ffffc900000d79a0 EFLAGS: 00000293 RAX: ffffffff89e123a7 RBX: 0000000000000000 RCX: ffff88801cafda00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900000d7a50 R08: ffffffff89e1237d R09: 1ffffffff2856724 R10: dffffc0000000000 R11: fffffbfff2856725 R12: dffffc0000000000 R13: 0000000000000200 R14: 0000000000000046 R15: 1ffff9200001af34 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbdbffa66c0 CR3: 00000000277be000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> </IRQ> <TASK> nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:345 [inline] gc_worker+0x30f/0x1530 net/netfilter/nf_conntrack_core.c:1534 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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
