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: 4447 Comm: syz.1.201 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 : [<813ce498>] lr : [<813ce488>] psr: 60000013 sp : df9bdd30 ip : df9bdd30 fp : df9bdd54 r10: 82b25910 r9 : 00000003 r8 : 8419b6c0 r7 : df9bdd90 r6 : 8419b6c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85ca6d40 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 8419b6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8419b6c0 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 0xdf9bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdf9bc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.201 (pid: 4447, stack limit = 0xdf9bc000) Stack: (0xdf9bdd30 to 0xdf9be000) dd20: 823f12fc 8419b6c0 829d1bf4 829d1bf4 dd40: 81e17c9c 8419b704 df9bdd8c df9bdd58 813ca528 813ce330 200000c0 00000000 dd60: df9bdd7c 200000c0 8419b6c0 b5403587 200000c0 86334800 40946400 00000003 dd80: df9bde4c df9bdd90 813c6074 813ca42c 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 4676119e 00000000 84bd0600 8419b6c0 200000c0 200000c0 86334800 de40: df9bdf14 df9bde50 813c7040 813c5f80 00000000 00000000 00000000 4676119e de60: 00000000 00000000 824625b4 0000005f 83cf0448 8419b6f0 841b3d44 86334800 de80: df9bdee4 df9bde90 807a755c 8079d954 00000064 00000001 00000000 df9bdeac dea0: 84ba2d90 834ec330 00006400 0000000b df9bdea0 00000000 00000000 4676119e dec0: 84bd0600 40946400 200000c0 200000c0 84bd0600 00000006 df9bdef4 df9bdee8 dee0: 807a767c 4676119e df9bdf14 40946400 00000000 84bd0601 200000c0 84bd0600 df00: 00000006 86334800 df9bdfa4 df9bdf18 80578798 813c6a70 ecac8b10 86334800 df20: df9bdf3c df9bdf30 81a606d8 81a605a8 df9bdf54 df9bdf40 8025c484 8028d914 df40: df9bdfb0 40000000 df9bdf84 df9bdf58 802229ec 8025c440 00000000 8281cfb4 df60: df9bdfb0 0014ca70 ecac8b10 80222940 00000000 4676119e df9bdfac 00000000 df80: 00000000 00316448 00000036 8020029c 86334800 00000036 00000000 df9bdfa8 dfa0: 80200060 80578674 00000000 00000000 00000006 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f570bc dfe0: 76f56ec0 76f56eb0 000195a4 00132510 60000010 00000006 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8419b704 r5:81e17c9c r4:829d1bf4 [<813ca420>] (comedi_device_attach) from [<813c6074>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:86334800 r7:200000c0 r6:b5403587 r5:8419b6c0 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:86334800 r7:200000c0 r6:200000c0 r5:8419b6c0 r4:84bd0600 [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:86334800 r9:00000006 r8:84bd0600 r7:200000c0 r6:84bd0601 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9bdfa8 to 0xdf9bdff0) dfa0: 00000000 00000000 00000006 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f570bc dfe0: 76f56ec0 76f56eb0 000195a4 00132510 r10:00000036 r9:86334800 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