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Message-ID: <000000000000a0424f061cff5b6b@google.com> Date: Thu, 11 Jul 2024 14:22:19 -0700 From: syzbot <syzbot+6212b93592985c1211e8@...kaller.appspotmail.com> To: anna-maria@...utronix.de, frederic@...nel.org, linux-kernel@...r.kernel.org, mingo@...nel.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de Subject: [syzbot] [kernel?] WARNING: locking bug in sched_tick Hello, syzbot found the following issue on: HEAD commit: c6653f49e4fd Merge tag 'powerpc-6.10-4' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1785dd69980000 kernel config: https://syzkaller.appspot.com/x/.config?x=864caee5f78cab51 dashboard link: https://syzkaller.appspot.com/bug?extid=6212b93592985c1211e8 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/cb0dd3b0fc75/disk-c6653f49.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed91ee4fa1ee/vmlinux-c6653f49.xz kernel image: https://storage.googleapis.com/syzbot-assets/567a4c1329fc/bzImage-c6653f49.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6212b93592985c1211e8@...kaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 3650 at kernel/locking/lockdep.c:232 hlock_class kernel/locking/lockdep.c:232 [inline] WARNING: CPU: 1 PID: 3650 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4773 [inline] WARNING: CPU: 1 PID: 3650 at kernel/locking/lockdep.c:232 __lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087 Modules linked in: CPU: 1 PID: 3650 Comm: kworker/u8:10 Not tainted 6.10.0-rc6-syzkaller-00223-gc6653f49e4fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:hlock_class kernel/locking/lockdep.c:232 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4773 [inline] RIP: 0010:__lock_acquire+0x573/0x1fd0 kernel/locking/lockdep.c:5087 Code: 00 00 83 3d 0e 08 3b 0e 00 75 23 90 48 c7 c7 e0 b9 ca 8b 48 c7 c6 80 bc ca 8b e8 18 e2 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f RSP: 0018:ffffc90000a189b0 EFLAGS: 00010046 RAX: 83a97af55935d700 RBX: 0000000000001ef0 RCX: ffff88802d523c00 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000014 R08: ffffffff81585822 R09: 1ffff110172a519a R10: dffffc0000000000 R11: ffffed10172a519b R12: 0000000000000001 R13: ffff88802d523c00 R14: 0000000000000014 R15: ffff88802d5247a0 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000454b8000 CR4: 0000000000350ef0 Call Trace: <IRQ> lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:567 raw_spin_rq_lock kernel/sched/sched.h:1406 [inline] rq_lock kernel/sched/sched.h:1702 [inline] sched_tick+0xa9/0x730 kernel/sched/core.c:5678 update_process_times+0x202/0x230 kernel/time/timer.c:2490 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x553/0xd50 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+0xa1/0xc0 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 8e 17 6b f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 d8 d4 f5 65 8b 05 64 0f 73 74 85 c0 74 43 48 c7 04 24 0e 36 RSP: 0018:ffffc9000af86b60 EFLAGS: 00000206 RAX: 83a97af55935d700 RBX: 1ffff920015f0d70 RCX: ffffffff8172da6a RDX: dffffc0000000000 RSI: ffffffff8bcabb40 RDI: 0000000000000001 RBP: ffffc9000af86bf0 R08: ffffffff92fa763f R09: 1ffffffff25f4ec7 R10: dffffc0000000000 R11: fffffbfff25f4ec8 R12: dffffc0000000000 R13: 1ffff920015f0d6c R14: ffffc9000af86b80 R15: 0000000000000246 debug_object_activate+0x3e4/0x510 lib/debugobjects.c:726 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline] kvfree_call_rcu+0x99/0x790 kernel/rcu/tree.c:3772 cfg80211_update_known_bss+0xb39/0x1500 net/wireless/scan.c:1862 __cfg80211_bss_update+0x150/0x20c0 net/wireless/scan.c:1908 cfg80211_inform_single_bss_data+0xfd6/0x2360 net/wireless/scan.c:2289 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3117 cfg80211_inform_bss_frame_data+0x3bc/0x720 net/wireless/scan.c:3207 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226 ieee80211_rx_bss_info net/mac80211/ibss.c:1099 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1578 [inline] ieee80211_ibss_rx_queued_mgmt+0x1962/0x2d70 net/mac80211/ibss.c:1605 ieee80211_iface_process_skb net/mac80211/iface.c:1603 [inline] ieee80211_iface_work+0x8a3/0xf10 net/mac80211/iface.c:1657 cfg80211_wiphy_work+0x223/0x260 net/wireless/core.c:437 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 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> ---------------- Code disassembly (best guess): 0: 9c pushf 1: 8f 44 24 20 pop 0x20(%rsp) 5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1) a: 74 08 je 0x14 c: 4c 89 f7 mov %r14,%rdi f: e8 8e 17 6b f6 call 0xf66b17a2 14: f6 44 24 21 02 testb $0x2,0x21(%rsp) 19: 75 52 jne 0x6d 1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 53 d8 d4 f5 call 0xf5d4d882 <-- trapping instruction 2f: 65 8b 05 64 0f 73 74 mov %gs:0x74730f64(%rip),%eax # 0x74730f9a 36: 85 c0 test %eax,%eax 38: 74 43 je 0x7d 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: 04 24 add $0x24,%al 3e: 0e (bad) 3f: 36 ss --- 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@...glegroups.com. 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
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