syzbot has found a reproducer for the following issue on: HEAD commit: d1f2d51b711a Merge tag 'clk-fixes-for-linus' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15231f29980000 kernel config: https://syzkaller.appspot.com/x/.config?x=58a85aa6925a8b78 dashboard link: https://syzkaller.appspot.com/bug?extid=7e51ea277ea81fe6935d 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=17dc6bc7980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=174a8e00580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8b52ee4d6014/disk-d1f2d51b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3409402d9dfd/vmlinux-d1f2d51b.xz kernel image: https://storage.googleapis.com/syzbot-assets/7da5cc92617b/bzImage-d1f2d51b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7e51ea277ea81fe6935d@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=9341, q=292 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294972849-4294962347), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g9341 f0x2 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:26144 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5268 Comm: udevd Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline] RIP: 0010:write_comp_data kernel/kcov.c:244 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:313 Code: 44 0a 20 e9 35 b0 5c 0a 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 00 d7 03 00 65 8b 05 00 46 70 7e 25 00 01 ff 00 74 RSP: 0018:ffffc900000069e0 EFLAGS: 00000046 RAX: 0000000080010104 RBX: 0000000080010103 RCX: 0000000000010104 RDX: 0000000000010100 RSI: 0000000080010103 RDI: 0000000000000000 RBP: ffffc90000006ac0 R08: ffffffff814145c5 R09: ffffffff814140bf R10: 0000000000000003 R11: ffff888029290000 R12: ffffc900032cff58 R13: dffffc0000000000 R14: ffffc900032c8000 R15: ffffc900032cff60 FS: 00007f0566290c80(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e30c37180 CR3: 0000000024292000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <IRQ> should_resched arch/x86/include/asm/preempt.h:103 [inline] unwind_next_frame+0x1e75/0x2a00 arch/x86/kernel/unwind_orc.c:672 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x149/0x360 mm/slub.c:4598 dummy_timer+0x7ce/0x45a0 drivers/usb/gadget/udc/dummy_hcd.c:1981 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_cmp4+0x2d/0x90 kernel/kcov.c:287 Code: fa 4c 8b 04 24 65 48 8b 14 25 00 d7 03 00 65 8b 05 80 48 70 7e 25 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 1c 16 00 00 00 <74> 52 8b 82 f8 15 00 00 83 f8 03 75 47 48 8b 8a 00 16 00 00 44 8b RSP: 0018:ffffc90000007580 EFLAGS: 00000246 RAX: 0000000000000100 RBX: 0000000000000002 RCX: ffff888029290000 RDX: ffff888029290000 RSI: 0000000000000002 RDI: 0000000000000002 RBP: ffffc90000007660 R08: ffffffff814144cb R09: ffffffff814140bf R10: 0000000000000003 R11: ffff888029290000 R12: ffffc90000007fe8 R13: dffffc0000000000 R14: 0000000000000002 R15: 1ffff92000000ecc unwind_next_frame+0x1d7b/0x2a00 arch/x86/kernel/unwind_orc.c:664 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2256 [inline] slab_free mm/slub.c:4477 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4552 skb_kfree_head net/core/skbuff.c:1082 [inline] skb_free_head net/core/skbuff.c:1096 [inline] skb_release_data+0x64d/0x880 net/core/skbuff.c:1123 skb_release_all net/core/skbuff.c:1188 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] consume_skb+0xb1/0x160 net/core/skbuff.c:1426 mac80211_hwsim_beacon_tx+0x3bf/0x850 drivers/net/wireless/virtual/mac80211_hwsim.c:2315 __iterate_interfaces+0x224/0x510 net/mac80211/util.c:772 ieee80211_iterate_active_interfaces_atomic+0xd8/0x170 net/mac80211/util.c:808 mac80211_hwsim_beacon+0xd4/0x1f0 drivers/net/wireless/virtual/mac80211_hwsim.c:2345 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1753 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1770 handle_softirqs+0x2c6/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ae 0a 37 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> f3 37 9f f5 65 8b 05 c4 0d 40 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc900032cf840 EFLAGS: 00000206 RAX: 099e6b37ca25bc00 RBX: 1ffff92000659f0c RCX: ffffffff81703fea RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001 RBP: ffffc900032cf8d0 R08: ffffffff941e4877 R09: 1ffffffff283c90e R10: dffffc0000000000 R11: fffffbfff283c90f R12: dffffc0000000000 R13: 1ffff92000659f08 R14: ffffc900032cf860 R15: 0000000000000246 __debug_check_no_obj_freed lib/debugobjects.c:999 [inline] debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1020 free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0x38a/0xea0 mm/page_alloc.c:2619 discard_slab mm/slub.c:2587 [inline] __put_partials+0xeb/0x130 mm/slub.c:3055 put_cpu_partial+0x17c/0x250 mm/slub.c:3130 __slab_free+0x2ea/0x3d0 mm/slub.c:4347 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/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:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3992 [inline] slab_alloc_node mm/slub.c:4041 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4048 getname_flags+0xb7/0x540 fs/namei.c:139 vfs_fstatat+0x12c/0x190 fs/stat.c:340 __do_sys_newfstatat fs/stat.c:505 [inline] __se_sys_newfstatat fs/stat.c:499 [inline] __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:499 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: 0033:0x7f0565f165f4 Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8 RSP: 002b:00007ffd91bb1a68 EFLAGS: 00000206 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 0000556c2c172550 RCX: 00007f0565f165f4 RDX: 00007ffd91bb1a78 RSI: 00007ffd91bb1b08 RDI: 00000000ffffff9c RBP: 0000556bf1240df3 R08: 0000556bf1240df3 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000206 R12: 0000000000000000 R13: 0000556c2c172640 R14: 00007ffd91bb1b08 R15: 0000556bf1240a04 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 6.769 msecs --- 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.
