genirq: Flags mismatch irq 31. 00200001 (comedi_parport) vs. 00200081 (virtio0) 8<--- cut here --- Unable to 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: 12544 Comm: syz.0.766 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 : [<813ce330>] lr : [<813ce320>] psr: 60000013 sp : dfaa9d30 ip : dfaa9d30 fp : dfaa9d54 r10: 82b25908 r9 : 00000003 r8 : 8417dcc0 r7 : dfaa9d90 r6 : 8417dcc0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1771c r1 : 00000001 r0 : 813cdfa0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85b75f80 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 8417dcc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfaa8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8417dcc0 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 0xdfaa8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfaa8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.766 (pid: 12544, stack limit = 0xdfaa8000) Stack: (0xdfaa9d30 to 0xdfaaa000) 9d20: 823f127c 8417dcc0 829d1bf4 829d1bf4 9d40: 81e17bdc 8417dd04 dfaa9d8c dfaa9d58 813ca3c0 813ce1c8 200000c0 00000000 9d60: dfaa9d7c 200000c0 8417dcc0 b5403587 200000c0 86559800 40946400 00000003 9d80: dfaa9e4c dfaa9d90 813c5f0c 813ca2c4 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 0000001f 40010000 00000004 0000009a 00000cc7 00000004 9dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000005 9de0: 10000105 00000000 00000009 00000003 00000009 00000087 00000010 00000001 9e00: 20001e58 0082000b 00000e69 0000003c 00000008 00000006 ffffffff effffff8 9e20: 00000000 c4729b0c 00000000 849dab40 8417dcc0 200000c0 200000c0 86559800 9e40: dfaa9f14 dfaa9e50 813c6ed8 813c5e18 00000000 00000000 00000000 c4729b0c 9e60: 00000000 00000000 824625b4 0000005f 840e0c28 8417dcf0 841739e4 86559800 9e80: dfaa9ee4 dfaa9e90 807a7434 8079d82c 00000064 00000001 00000000 dfaa9eac 9ea0: 85adb910 834dc908 00006400 0000000b dfaa9ea0 00000000 00000000 c4729b0c 9ec0: 849dab40 40946400 200000c0 200000c0 849dab40 00000003 dfaa9ef4 dfaa9ee8 9ee0: 807a7554 c4729b0c dfaa9f14 40946400 00000000 849dab41 200000c0 849dab40 9f00: 00000003 86559800 dfaa9fa4 dfaa9f18 805786e0 813c6908 ecac8b10 86559800 9f20: dfaa9f3c dfaa9f30 81a60598 81a60468 dfaa9f54 dfaa9f40 8025c484 8028d914 9f40: dfaa9fb0 40000000 dfaa9f84 dfaa9f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfaa9fb0 0014ca70 ecac8b10 80222940 00000000 c4729b0c dfaa9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 86559800 00000036 00000000 dfaa9fa8 9fa0: 80200060 805785bc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f320bc 9fe0: 76f31ec0 76f31eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce1bc>] (parport_attach) from [<813ca3c0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8417dd04 r5:81e17bdc r4:829d1bf4 [<813ca2b8>] (comedi_device_attach) from [<813c5f0c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:86559800 r7:200000c0 r6:b5403587 r5:8417dcc0 r4:200000c0 [<813c5e0c>] (do_devconfig_ioctl) from [<813c6ed8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:86559800 r7:200000c0 r6:200000c0 r5:8417dcc0 r4:849dab40 [<813c68fc>] (comedi_unlocked_ioctl) from [<805786e0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c68fc>] (comedi_unlocked_ioctl) from [<805786e0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c68fc>] (comedi_unlocked_ioctl) from [<805786e0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c68fc>] (comedi_unlocked_ioctl) from [<805786e0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:86559800 r9:00000003 r8:849dab40 r7:200000c0 r6:849dab41 r5:00000000 r4:40946400 [<805785b0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaa9fa8 to 0xdfaa9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f320bc 9fe0: 76f31ec0 76f31eb0 000195a4 00132510 r10:00000036 r9:86559800 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