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Message-ID: <0000000000008b834b0614e2a7d6@google.com> Date: Sat, 30 Mar 2024 08:46:06 -0700 From: syzbot <syzbot+81f5ca46b043d4a1b789@...kaller.appspotmail.com> To: hdanton@...a.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [audit?] [bpf?] INFO: rcu detected stall in kauditd_thread (4) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in hrtimer_forward ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5464 at kernel/time/hrtimer.c:1053 hrtimer_forward+0x1d3/0x260 kernel/time/hrtimer.c:1053 Modules linked in: CPU: 1 PID: 5464 Comm: udevd Not tainted 6.9.0-rc1-syzkaller-00274-g486291a0e624-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:hrtimer_forward+0x1d3/0x260 kernel/time/hrtimer.c:1053 Code: 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 49 bc ff ff ff ff ff ff ff 7f eb 85 49 bc ff ff ff ff ff ff ff 7f eb c3 e8 9e d5 12 00 90 <0f> 0b 90 48 c7 04 24 00 00 00 00 eb b9 e8 8b d5 12 00 4c 89 e0 4c RSP: 0018:ffffc90000a08d30 EFLAGS: 00010046 RAX: 0000000080010001 RBX: ffff88807bc91340 RCX: ffffffff817a9ad4 RDX: ffff888029330000 RSI: ffffffff817a9c12 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 00000000000035cd R13: 58f2e2407277c48d R14: 58f2e24072778ec0 R15: 0000000000030d40 FS: 00007f983e6dac80(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa573182b10 CR3: 000000001e630000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> hrtimer_forward_now include/linux/hrtimer.h:355 [inline] advance_sched+0x670/0xc50 net/sched/sch_taprio.c:983 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 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:on_stack arch/x86/include/asm/stacktrace.h:59 [inline] RIP: 0010:stack_access_ok+0x1cd/0x270 arch/x86/kernel/unwind_orc.c:393 Code: 8b 44 24 08 48 01 c5 49 39 ec 0f 83 3e ff ff ff e8 a8 ab 50 00 48 39 eb 41 0f 93 c6 e9 30 ff ff ff e8 97 ab 50 00 4c 8b 3c 24 <4c> 39 fd 0f 83 d3 fe ff ff e8 85 ab 50 00 48 8b 44 24 08 48 01 e8 RSP: 0018:ffffc90003b57870 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffc90003b57990 RCX: ffffffff813cc4e6 RDX: ffff888029330000 RSI: ffffffff813cc619 RDI: 0000000000000005 RBP: ffffc90003b57980 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003b57998 R13: ffffc90003b579a0 R14: ffffc90003b50000 R15: ffffc90003b58000 deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] unwind_next_frame+0xd9b/0x23a0 arch/x86/kernel/unwind_orc.c:585 __unwind_start+0x5aa/0x880 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xb2/0x170 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x12e/0x380 mm/slub.c:4344 putname+0x12e/0x170 fs/namei.c:273 do_sys_openat2+0x160/0x1e0 fs/open.c:1414 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f983e3169a4 Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff4c215900 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f983e3169a4 RDX: 0000000000080241 RSI: 00007fff4c215e48 RDI: 00000000ffffff9c RBP: 00007fff4c215e48 R08: 0000000000000004 R09: 0000000000000001 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000080241 R13: 000055d9597f572e R14: 0000000000000001 R15: 000055d959810160 </TASK> ---------------- Code disassembly (best guess): 0: 8b 44 24 08 mov 0x8(%rsp),%eax 4: 48 01 c5 add %rax,%rbp 7: 49 39 ec cmp %rbp,%r12 a: 0f 83 3e ff ff ff jae 0xffffff4e 10: e8 a8 ab 50 00 call 0x50abbd 15: 48 39 eb cmp %rbp,%rbx 18: 41 0f 93 c6 setae %r14b 1c: e9 30 ff ff ff jmp 0xffffff51 21: e8 97 ab 50 00 call 0x50abbd 26: 4c 8b 3c 24 mov (%rsp),%r15 * 2a: 4c 39 fd cmp %r15,%rbp <-- trapping instruction 2d: 0f 83 d3 fe ff ff jae 0xffffff06 33: e8 85 ab 50 00 call 0x50abbd 38: 48 8b 44 24 08 mov 0x8(%rsp),%rax 3d: 48 01 e8 add %rbp,%rax Tested on: commit: 486291a0 Merge tag 'drm-fixes-2024-03-30' of https://g.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master console output: https://syzkaller.appspot.com/x/log.txt?x=129ac3c6180000 kernel config: https://syzkaller.appspot.com/x/.config?x=f64ec427e98bccd7 dashboard link: https://syzkaller.appspot.com/bug?extid=81f5ca46b043d4a1b789 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=15be4109180000
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