genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 8806 Comm: syz.2.1185 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ce490>] lr : [<813ce480>] psr: 60000013 sp : e011dd30 ip : e011dd30 fp : e011dd54 r10: 82b25910 r9 : 00000003 r8 : 8411f240 r7 : e011dd90 r6 : 8411f240 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1771c r1 : 00000001 r0 : 813ce100 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8527a240 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8411f240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe011c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8411f240 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe011c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe011c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.1185 (pid: 8806, stack limit = 0xe011c000) Stack: (0xe011dd30 to 0xe011e000) dd20: 823f12b4 8411f240 829d1bf4 829d1bf4 dd40: 81e17bdc 8411f284 e011dd8c e011dd58 813ca520 813ce328 200000c0 00000000 dd60: e011dd7c 200000c0 8411f240 b5403587 200000c0 83a14800 40946400 00000003 dd80: e011de4c e011dd90 813c606c 813ca424 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 ddc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 dde0: 10000105 00000000 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 de00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 fffffffd effffff8 de20: 00000000 6ffe4432 00000000 8506f240 8411f240 200000c0 200000c0 83a14800 de40: e011df14 e011de50 813c7038 813c5f78 00000000 00000000 00000000 6ffe4432 de60: 00000000 00000000 824625b4 0000005f 83cd59f0 8411f270 841491bc 83a14800 de80: e011dee4 e011de90 807a7484 8079d87c 00000064 00000001 00000000 e011deac dea0: 85080310 834eb440 00006400 0000000b e011dea0 00000000 00000000 6ffe4432 dec0: 8506f240 40946400 200000c0 200000c0 8506f240 00000003 e011def4 e011dee8 dee0: 807a75a4 6ffe4432 e011df14 40946400 00000000 8506f241 200000c0 8506f240 df00: 00000003 83a14800 e011dfa4 e011df18 80578730 813c6a68 ecac8b10 83a14800 df20: e011df3c e011df30 81a606f8 81a605c8 e011df54 e011df40 8025c484 8028d914 df40: e011dfb0 40000000 e011df84 e011df58 802229ec 8025c440 00000000 8281cfb4 df60: e011dfb0 0014ca70 ecac8b10 80222940 00000000 6ffe4432 e011dfac 00000000 df80: 00000000 00316308 00000036 8020029c 83a14800 00000036 00000000 e011dfa8 dfa0: 80200060 8057860c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff80bc dfe0: 76ff7ec0 76ff7eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce31c>] (parport_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8411f284 r5:81e17bdc r4:829d1bf4 [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83a14800 r7:200000c0 r6:b5403587 r5:8411f240 r4:200000c0 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83a14800 r7:200000c0 r6:200000c0 r5:8411f240 r4:8506f240 [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<80578730>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83a14800 r9:00000003 r8:8506f240 r7:200000c0 r6:8506f241 r5:00000000 r4:40946400 [<80578600>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe011dfa8 to 0xe011dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff80bc dfe0: 76ff7ec0 76ff7eb0 000195a4 00132510 r10:00000036 r9:83a14800 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction