syzbot has found a reproducer for the following issue on: HEAD commit: 614cb589 Merge tag 'acpi-5.11-rc1-2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=151d558f500000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e7e34a83d606100 dashboard link: https://syzkaller.appspot.com/bug?extid=78bab6958a614b0c80b9 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1196822b500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c75f97500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+78bab6958a614b0c80b9@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at net/can/isotp.c:835 isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835 Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:isotp_tx_timer_handler+0x65f/0xba0 net/can/isotp.c:835 Code: c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f 08 84 c0 0f 85 b8 04 00 00 41 88 54 24 05 e9 07 fb ff ff 40 84 ed 75 21 e8 c1 64 7e f9 <0f> 0b 45 31 e4 e8 b7 64 7e f9 44 89 e0 48 83 c4 48 5b 5d 41 5c 41 RSP: 0018:ffffc90000007dc8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802a288518 RCX: 0000000000000100 RDX: ffffffff8b49bc00 RSI: ffffffff87f4e3ff RDI: 0000000000000003 RBP: 0000000000000000 R08: ffffffff8a7baf80 R09: ffffffff87f4ddfe R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880b9c26c80 R14: ffff8880b9c26a00 R15: ffff88802a288000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd91884b10 CR3: 000000001b5d4000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x609/0xea0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600 __do_softirq+0x2bc/0xa77 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0x17f/0x200 kernel/softirq.c:420 irq_exit_rcu+0x5/0x20 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:169 [inline] RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] RIP: 0010:acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:516 Code: ed 26 57 f8 84 db 75 ac e8 64 20 57 f8 e8 3f f6 5c f8 e9 0c 00 00 00 e8 55 20 57 f8 0f 00 2d ae 57 ae 00 e8 49 20 57 f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 24 28 57 f8 48 85 db RSP: 0018:ffffffff8b407d60 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffffffff8b49bc00 RSI: ffffffff891c2877 RDI: 0000000000000000 RBP: ffff888141653064 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff81791ed8 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888141653000 R14: ffff888141653064 R15: ffff888017f65004 acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:647 cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x3eb/0x590 kernel/sched/idle.c:299 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:396 start_kernel+0x496/0x4b7 init/main.c:1061 secondary_startup_64_no_verify+0xb0/0xbb
