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: 6694 Comm: syz.0.464 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 : [<81435e54>] lr : [<81435e44>] psr: 60000013 sp : dfa8dd30 ip : dfa8dd30 fp : dfa8dd54 r10: 82b2f0bc r9 : 00000003 r8 : 8301a000 r7 : dfa8dd90 r6 : 8301a000 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24ef8 r1 : 00000001 r0 : 81435ac4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8629d180 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 8301a000 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 8301a000 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 0xdfa8c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.0.464 (pid: 6694, stack limit = 0xdfa8c000) Stack: (0xdfa8dd30 to 0xdfa8e000) dd20: 824458d0 8301a000 829d6b1c 829d6b1c dd40: 81e253b8 00000000 dfa8dd8c dfa8dd58 814319c8 81435cec 40946400 00000000 dd60: dfa8dd7c 200000c0 8301a000 b5403587 40946400 00000002 00000003 85143100 dd80: dfa8de4c dfa8dd90 8142d1d4 814318c8 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000001f 00010000 000000ff 00000005 00000cc7 00000008 ddc0: 00000007 0000000a 00000100 00000002 ffffffff 00000001 00000009 00000003 dde0: 00000002 00000000 00000007 00000003 40000003 40000089 00000006 00000004 de00: 20001e58 0000000b 00000001 0000007c 00000208 00000006 00000000 0000000b de20: 00000000 064045ce 85143100 8532c0c0 8301a000 200000c0 40946400 00000002 de40: dfa8df14 dfa8de50 8142e4f8 8142d10c 00000000 064045ce 00000000 00000000 de60: 824b957c dfa8dea4 0000005f 842ec250 00000064 8301a030 dfa8dee4 dfa8de88 de80: 807d0908 807c6ce0 00000064 00000001 00000000 dfa8dea4 830e3610 83438908 dea0: 00006400 0000000b dfa8de98 00000000 00000000 064045ce 00000000 8532c0c0 dec0: 40946400 200000c0 200000c0 8532c0c0 00000003 85143100 dfa8def4 dfa8dee8 dee0: 807d0a38 064045ce dfa8df14 00000000 8532c0c1 40946400 200000c0 8532c0c0 df00: 00000003 85143100 dfa8dfa4 dfa8df18 805912c0 8142e1b0 ecac8b10 85143100 df20: dfa8df3c dfa8df30 81ae82b4 81ae8180 dfa8df54 dfa8df40 8025a894 8028c408 df40: dfa8dfb0 40000000 dfa8df84 dfa8df58 80220bf8 8025a850 00000000 8281d27c df60: dfa8dfb0 0013e4a0 ecac8b10 80220b4c 00000000 064045ce dfa8dfac 00000000 df80: 00000000 00346310 00000036 8020029c 85143100 00000036 00000000 dfa8dfa8 dfa0: 80200060 80591088 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3c0dc dfe0: 76f3be88 76f3be78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<81435ce0>] (parport_attach) from [<814319c8>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1077) r6:00000000 r5:81e253b8 r4:829d6b1c [<814318bc>] (comedi_device_attach) from [<8142d1d4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:85143100 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301a000 r4:200000c0 [<8142d100>] (do_devconfig_ioctl) from [<8142e4f8>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200000c0 r5:8301a000 r4:8532c0c0 [<8142e1a4>] (comedi_unlocked_ioctl) from [<805912c0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142e1a4>] (comedi_unlocked_ioctl) from [<805912c0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142e1a4>] (comedi_unlocked_ioctl) from [<805912c0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142e1a4>] (comedi_unlocked_ioctl) from [<805912c0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85143100 r9:00000003 r8:8532c0c0 r7:200000c0 r6:40946400 r5:8532c0c1 r4:00000000 [<8059107c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa8dfa8 to 0xdfa8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3c0dc dfe0: 76f3be88 76f3be78 00018bc4 00130300 r10:00000036 r9:85143100 r8:8020029c r7:00000036 r6:00346310 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