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: 11580 Comm: syz.1.1526 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: 60000113 sp : dfa69d30 ip : dfa69d30 fp : dfa69d54 r10: 82b25908 r9 : 00000003 r8 : 8410fcc0 r7 : dfa69d90 r6 : 8410fcc0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1771c r1 : 00000001 r0 : 813cdfa0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84f0fe40 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 8410fcc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8410fcc0 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 0xdfa68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.1526 (pid: 11580, stack limit = 0xdfa68000) Stack: (0xdfa69d30 to 0xdfa6a000) 9d20: 823f127c 8410fcc0 829d1bf4 829d1bf4 9d40: 81e17bdc 8410fd04 dfa69d8c dfa69d58 813ca3c0 813ce1c8 200000c0 00000000 9d60: dfa69d7c 200000c0 8410fcc0 b5403587 200000c0 855eb000 40946400 00000003 9d80: dfa69e4c dfa69d90 813c5f0c 813ca2c4 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 9dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 9de0: 10000105 00000000 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 9e00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 fffffffd effffff8 9e20: 00000000 6f7b06bd 00000000 85b02d80 8410fcc0 200000c0 200000c0 855eb000 9e40: dfa69f14 dfa69e50 813c6ed8 813c5e18 00000000 00000000 00000000 6f7b06bd 9e60: 00000000 00000000 824625b4 0000005f 841cc640 8410fcf0 841be204 855eb000 9e80: dfa69ee4 dfa69e90 807a7434 8079d82c 00000064 00000001 00000000 dfa69eac 9ea0: 84f0dcd0 834e1d48 00006400 0000000b dfa69ea0 00000000 00000000 6f7b06bd 9ec0: 85b02d80 40946400 200000c0 200000c0 85b02d80 00000003 dfa69ef4 dfa69ee8 9ee0: 807a7554 6f7b06bd dfa69f14 40946400 00000000 85b02d81 200000c0 85b02d80 9f00: 00000003 855eb000 dfa69fa4 dfa69f18 805786e0 813c6908 ecac8b10 855eb000 9f20: dfa69f3c dfa69f30 81a60598 81a60468 dfa69f54 dfa69f40 8025c484 8028d914 9f40: dfa69fb0 40000000 dfa69f84 dfa69f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfa69fb0 0014ca70 ecac8b10 80222940 00000000 6f7b06bd dfa69fac 00000000 9f80: 00000000 00316448 00000036 8020029c 855eb000 00000036 00000000 dfa69fa8 9fa0: 80200060 805785bc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce1bc>] (parport_attach) from [<813ca3c0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8410fd04 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 r8:855eb000 r7:200000c0 r6:b5403587 r5:8410fcc0 r4:200000c0 [<813c5e0c>] (do_devconfig_ioctl) from [<813c6ed8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:855eb000 r7:200000c0 r6:200000c0 r5:8410fcc0 r4:85b02d80 [<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) r10:855eb000 r9:00000003 r8:85b02d80 r7:200000c0 r6:85b02d81 r5:00000000 r4:40946400 [<805785b0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa69fa8 to 0xdfa69ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 000195a4 00132510 r10:00000036 r9:855eb000 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