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: 12815 Comm: syz.0.2236 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81408900>] lr : [<814088f0>] psr: 60000013 sp : dfb8dd28 ip : dfb8dd28 fp : dfb8dd4c r10: 82b28ad8 r9 : 00000003 r8 : 83f76300 r7 : dfb8dd88 r6 : 83f76300 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1a338 r1 : 00000001 r0 : 81408570 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 858ee280 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 83f76300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 83f76300 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 0xdfb8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.2236 (pid: 12815, stack limit = 0xdfb8c000) Stack: (0xdfb8dd28 to 0xdfb8e000) dd20: 82432da0 83f76300 829d3f08 829d3f08 81e1a7f8 83f76344 dd40: dfb8dd84 dfb8dd50 814045a8 81408798 83f76330 00000000 dfb8dd74 200000c0 dd60: 83f76300 b5403587 83f76330 85956000 40946400 00000003 dfb8de44 dfb8dd88 dd80: 813fff00 814044ac 656d6f63 705f6964 6f707261 00007472 00000000 00004f27 dda0: 0000001f 00010000 00000004 00000005 00000cc7 00000008 00000007 0000000a ddc0: 00000100 00000002 00000001 00000002 00000001 00000006 00000101 00000000 dde0: 0001a449 00000003 40000003 00000089 0000caa7 00000000 20001e58 0000000b de00: 00000e69 0000003c 00000008 00000006 00000000 fffffff8 00000000 ec886976 de20: 00000000 85ffa480 83f76300 200000c0 83f76330 85956000 dfb8df14 dfb8de48 de40: 81400ef4 813ffe0c 00000000 00000000 00000000 dfb8de54 dfb8de54 ec886976 de60: 00000000 00000000 824a35ec 0000005f 84678448 00000064 845a16cc 85956000 de80: dfb8dee4 dfb8de90 807b7da0 807ae2c4 00000064 00000001 00000000 dfb8deac dea0: 84d723d0 834e8220 00006400 0000000b dfb8dea0 00000000 dfb8dd40 ec886976 dec0: 85ffa480 40946400 200000c0 200000c0 85ffa480 00000003 dfb8def4 dfb8dee8 dee0: 807b7ec0 ec886976 dfb8df14 40946400 00000000 85ffa481 200000c0 85ffa480 df00: 00000003 85956000 dfb8dfa4 dfb8df18 8058553c 81400944 ecac8b10 85956000 df20: dfb8df3c dfb8df30 81aaf3bc 81aaf28c dfb8df54 dfb8df40 8025bcbc 8028e0c4 df40: dfb8dfb0 40000000 dfb8df84 dfb8df58 80221a38 8025bc78 00000000 8281d17c df60: dfb8dfb0 0014c880 ecac8b10 8022198c 00000000 ec886976 dfb8dfac 00000000 df80: 00000000 00316310 00000036 8020029c 85956000 00000036 00000000 dfb8dfa8 dfa0: 80200060 80585418 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f050bc dfe0: 76f04ec0 76f04eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<8140878c>] (parport_attach) from [<814045a8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:83f76344 r5:81e1a7f8 r4:829d3f08 [<814044a0>] (comedi_device_attach) from [<813fff00>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85956000 r7:83f76330 r6:b5403587 r5:83f76300 r4:200000c0 [<813ffe00>] (do_devconfig_ioctl) from [<81400ef4>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85956000 r7:83f76330 r6:200000c0 r5:83f76300 r4:85ffa480 [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85956000 r9:00000003 r8:85ffa480 r7:200000c0 r6:85ffa481 r5:00000000 r4:40946400 [<8058540c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb8dfa8 to 0xdfb8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f050bc dfe0: 76f04ec0 76f04eb0 0001929c 00132320 r10:00000036 r9:85956000 r8:8020029c r7:00000036 r6:00316310 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