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Message-ID: <67c650e6.050a0220.1dee4d.01c8.GAE@google.com> Date: Mon, 03 Mar 2025 17:01:26 -0800 From: syzbot <syzbot+faf3a6cf579fc65591ca@...kaller.appspotmail.com> To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [usb?] general protection fault in dummy_timer (2) syzbot has found a reproducer for the following issue on: HEAD commit: 811d22141369 usb: dwc3: exynos: add support for exynos7870 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=1690e464580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f429368eda610a89 dashboard link: https://syzkaller.appspot.com/bug?extid=faf3a6cf579fc65591ca compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11500697980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c0764bd2a6ef/disk-811d2214.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a8d014106735/vmlinux-811d2214.xz kernel image: https://storage.googleapis.com/syzbot-assets/80062d83482e/bzImage-811d2214.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+faf3a6cf579fc65591ca@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000060: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000300-0x0000000000000307] CPU: 0 UID: 0 PID: 7918 Comm: syz-executor Not tainted 6.14.0-rc3-syzkaller-00056-g811d22141369 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:277 Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 2c 41 3a 6c 24 ff 74 ae 19 c0 RSP: 0018:ffffc90000007848 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff8747ce21 RCX: ffffffff8fb2a5e8 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff8747ce20 RBP: 0000000000000026 R08: 0000000000000001 R09: dffffc0000000000 R10: ffffffff8fb2a5f8 R11: ffffffff8fb2a5e8 R12: 0000000000000301 R13: dffffc0000000000 R14: 00000000000003b1 R15: ffffffff934e19e0 FS: 000055558b609500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f143e94aea2 CR3: 000000012b09c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> count_matching_names kernel/locking/lockdep.c:877 [inline] register_lock_class+0x63b/0x1240 kernel/locking/lockdep.c:1342 __lock_acquire+0x135/0x3c40 kernel/locking/lockdep.c:5103 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 complete_with_flags kernel/sched/completion.c:20 [inline] complete+0x1d/0x200 kernel/sched/completion.c:47 transfer drivers/usb/gadget/udc/dummy_hcd.c:1523 [inline] dummy_timer+0x1c37/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1978 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1882 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 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:lock_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5816 Code: b8 ff ff ff ff 65 0f c1 05 90 2f aa 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 RSP: 0018:ffffc9000446fc98 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 1ffff9200088df94 RCX: 00000000521e9cf7 RDX: 0000000000000001 RSI: ffffffff87281ac0 RDI: ffffffff8747c1a0 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff1f5cdc0 R10: ffffffff8fae6e07 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88ebe3c0 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock_sched include/linux/rcupdate.h:941 [inline] fd_install+0xc0/0x750 fs/file.c:639 do_sys_openat2+0x1a4/0x1e0 fs/open.c:1433 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f143e88ba51 Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d fa 1a 1f 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25 RSP: 002b:00007ffc6205c990 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007f143e88ba51 RDX: 0000000000080001 RSI: 00007f143e90fadc RDI: 00000000ffffff9c RBP: 00007f143e90fadc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 R13: 00007ffc6205ca30 R14: 00000000000aeedc R15: 00007ffc6205cfa0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:strcmp+0x5b/0xb0 lib/string.c:277 Code: fa 48 c1 e8 03 83 e2 07 42 0f b6 04 28 38 d0 7f 04 84 c0 75 58 0f b6 6b ff 4c 8d 66 01 48 89 f0 48 89 f2 48 c1 e8 03 83 e2 07 <42> 0f b6 04 28 38 d0 7f 04 84 c0 75 2c 41 3a 6c 24 ff 74 ae 19 c0 RSP: 0018:ffffc90000007848 EFLAGS: 00010046 RAX: 0000000000000060 RBX: ffffffff8747ce21 RCX: ffffffff8fb2a5e8 RDX: 0000000000000000 RSI: 0000000000000300 RDI: ffffffff8747ce20 RBP: 0000000000000026 R08: 0000000000000001 R09: dffffc0000000000 R10: ffffffff8fb2a5f8 R11: ffffffff8fb2a5e8 R12: 0000000000000301 R13: dffffc0000000000 R14: 00000000000003b1 R15: ffffffff934e19e0 FS: 000055558b609500(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f143e94aea2 CR3: 000000012b09c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: fa cli 1: 48 c1 e8 03 shr $0x3,%rax 5: 83 e2 07 and $0x7,%edx 8: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax d: 38 d0 cmp %dl,%al f: 7f 04 jg 0x15 11: 84 c0 test %al,%al 13: 75 58 jne 0x6d 15: 0f b6 6b ff movzbl -0x1(%rbx),%ebp 19: 4c 8d 66 01 lea 0x1(%rsi),%r12 1d: 48 89 f0 mov %rsi,%rax 20: 48 89 f2 mov %rsi,%rdx 23: 48 c1 e8 03 shr $0x3,%rax 27: 83 e2 07 and $0x7,%edx * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 38 d0 cmp %dl,%al 31: 7f 04 jg 0x37 33: 84 c0 test %al,%al 35: 75 2c jne 0x63 37: 41 3a 6c 24 ff cmp -0x1(%r12),%bpl 3c: 74 ae je 0xffffffec 3e: 19 c0 sbb %eax,%eax --- 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.
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