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: 1 UID: 0 PID: 4847 Comm: syz.2.140 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 : [<813cb460>] lr : [<813cb450>] psr: 60000013 sp : dfaddd30 ip : dfaddd30 fp : dfaddd54 r10: 82b24900 r9 : 00000003 r8 : 83874e40 r7 : dfaddd90 r6 : 83874e40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1765c r1 : 00000001 r0 : 813cb0d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85826100 DAC: 00000000 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 83874e40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfadc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 83874e40 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 0xdfadc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfadc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.140 (pid: 4847, stack limit = 0xdfadc000) Stack: (0xdfaddd30 to 0xdfade000) dd20: 823eccac 83874e40 829d1b3c 829d1b3c dd40: 81e17b1c 83874e84 dfaddd8c dfaddd58 813c74ec 813cb2f8 200000c0 00000000 dd60: dfaddd7c 200000c0 83874e40 b5403587 200000c0 84b40c00 40946400 00000003 dd80: dfadde4c dfaddd90 813c3038 813c73f0 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 ffffffff effffff8 de20: 00000000 03340128 00000000 849523c0 83874e40 200000c0 200000c0 84b40c00 de40: dfaddf14 dfadde50 813c4004 813c2f44 00000000 00000000 00000000 03340128 de60: 00000000 00000000 8245d5b4 0000005f 83bcb408 83874e70 83885f3c 84b40c00 de80: dfaddee4 dfadde90 807a5eac 8079c2a4 00000064 00000001 00000000 dfaddeac dea0: 85cd9790 834da000 00006400 0000000b dfaddea0 00000000 00000000 03340128 dec0: 849523c0 40946400 200000c0 200000c0 849523c0 00000004 dfaddef4 dfaddee8 dee0: 807a5fcc 03340128 dfaddf14 40946400 00000000 849523c1 200000c0 849523c0 df00: 00000004 84b40c00 dfaddfa4 dfaddf18 80577cd0 813c3a34 ecac8b10 84b40c00 df20: dfaddf3c dfaddf30 81a360d8 81a35fa8 dfaddf54 dfaddf40 8025c478 8028d90c df40: dfaddfb0 40000000 dfaddf84 dfaddf58 802229ec 8025c434 00000000 8281cf74 df60: dfaddfb0 0014ca70 ecac8b10 80222940 00000000 03340128 dfaddfac 00000000 df80: 00000000 00316448 00000036 8020029c 84b40c00 00000036 00000000 dfaddfa8 dfa0: 80200060 80577bac 00000000 00000000 00000004 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f3f0bc dfe0: 76f3eec0 76f3eeb0 000195a4 00132510 60000010 00000004 00000000 00000000 Call trace: [<813cb2ec>] (parport_attach) from [<813c74ec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83874e84 r5:81e17b1c r4:829d1b3c [<813c73e4>] (comedi_device_attach) from [<813c3038>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84b40c00 r7:200000c0 r6:b5403587 r5:83874e40 r4:200000c0 [<813c2f38>] (do_devconfig_ioctl) from [<813c4004>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84b40c00 r7:200000c0 r6:200000c0 r5:83874e40 r4:849523c0 [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84b40c00 r9:00000004 r8:849523c0 r7:200000c0 r6:849523c1 r5:00000000 r4:40946400 [<80577ba0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaddfa8 to 0xdfaddff0) dfa0: 00000000 00000000 00000004 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f3f0bc dfe0: 76f3eec0 76f3eeb0 000195a4 00132510 r10:00000036 r9:84b40c00 r8:8020029c r7:00000036 r6:00316448 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