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Date: Wed, 16 Nov 2022 02:52:37 -0800 From: syzbot <syzbot+10257d01dd285b15170a@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, krzysztof.kozlowski@...aro.org, kuba@...nel.org, linma@....edu.cn, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] BUG: unable to handle kernel NULL pointer dereference in nci_cmd_timer Hello, syzbot found the following issue on: HEAD commit: 9500fc6e9e60 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=16cbf7a5880000 kernel config: https://syzkaller.appspot.com/x/.config?x=b25c9f218686dd5e dashboard link: https://syzkaller.appspot.com/bug?extid=10257d01dd285b15170a compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1354dce9880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10880a95880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1363e60652f7/disk-9500fc6e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fcc4da811bb6/vmlinux-9500fc6e.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b554298f1fa/Image-9500fc6e.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+10257d01dd285b15170a@...kaller.appspotmail.com Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010c75b000 [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.0-rc5-syzkaller-32269-g9500fc6e9e60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __queue_work+0x3c4/0x8b4 lr : __queue_work+0x3c4/0x8b4 kernel/workqueue.c:1458 sp : ffff800008003d60 x29: ffff800008003d60 x28: 0000000000000000 x27: ffff80000d3a9000 x26: ffff80000d3ad050 x25: ffff80000d2fe008 x24: ffff80000db54000 x23: 0000000000000000 x22: 0000000000000023 x21: ffff0000c7a95400 x20: 0000000000000008 x19: ffff0000cd0d20f8 x18: ffff80000db78158 x17: ffff80000ddda198 x16: ffff80000dc18158 x15: ffff80000d3cbc80 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff80000d3cbc80 x11: ff8080000c07dfe4 x10: 0000000000000000 x9 : ffff80000c07dfe4 x8 : ffff80000d3cbc80 x7 : ffff80000813bae8 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff0000c0014c00 Call trace: __queue_work+0x3c4/0x8b4 kernel/workqueue.c:1458 queue_work_on+0xb0/0x15c kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nci_cmd_timer+0x30/0x40 net/nfc/nci/core.c:615 call_timer_fn+0x90/0x144 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x280/0x374 kernel/time/timer.c:1790 run_timer_softirq+0x34/0x5c kernel/time/timer.c:1803 _stext+0x168/0x37c ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x54 arch/arm64/kernel/entry.S:892 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84 invoke_softirq+0x70/0xbc kernel/softirq.c:452 __irq_exit_rcu+0xf0/0x140 kernel/softirq.c:650 irq_exit_rcu+0x10/0x40 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:580 arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0x48/0xb8 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x110/0x2d4 kernel/sched/idle.c:303 cpu_startup_entry+0x24/0x28 kernel/sched/idle.c:400 kernel_init+0x0/0x290 init/main.c:729 start_kernel+0x0/0x620 init/main.c:890 start_kernel+0x450/0x620 init/main.c:1145 __primary_switched+0xb4/0xbc arch/arm64/kernel/head.S:471 Code: 94001384 aa0003f7 aa1303e0 9400144a (f94002f8) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 94001384 bl 0x4e10 4: aa0003f7 mov x23, x0 8: aa1303e0 mov x0, x19 c: 9400144a bl 0x5134 * 10: f94002f8 ldr x24, [x23] <-- trapping instruction --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
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