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: 4617 Comm: syz.0.95 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 : [<813ce318>] lr : [<813ce308>] psr: 60000113 sp : dfc25d30 ip : dfc25d30 fp : dfc25d54 r10: 82b25908 r9 : 00000003 r8 : 8407dd80 r7 : dfc25d90 r6 : 8407dd80 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1771c r1 : 00000001 r0 : 813cdf88 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85881000 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 8407dd80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc24000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 8407dd80 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 0xdfc24000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfc24000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.95 (pid: 4617, stack limit = 0xdfc24000) Stack: (0xdfc25d30 to 0xdfc26000) 5d20: 823f1248 8407dd80 829d1bf4 829d1bf4 5d40: 81e17bdc 8407ddc4 dfc25d8c dfc25d58 813ca3a8 813ce1b0 200000c0 00000000 5d60: dfc25d7c 200000c0 8407dd80 b5403587 200000c0 848da400 40946400 00000003 5d80: dfc25e4c dfc25d90 813c5ef4 813ca2ac 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 0000001f 00010000 00000004 00000003 00000cc7 00000004 5dc0: 00080008 0000000e 00000006 00000002 00000001 00000007 00000001 00000006 5de0: 10000105 00000000 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 5e00: 20001e58 0080000b 00000e69 0000003c 00000008 00000006 fffffffd effffff8 5e20: 00000000 fad3eba5 00000000 84feb6c0 8407dd80 200000c0 200000c0 848da400 5e40: dfc25f14 dfc25e50 813c6ec0 813c5e00 00000000 00000000 00000000 fad3eba5 5e60: 00000000 00000000 824625b4 0000005f 83dc0838 8407ddb0 8419d174 848da400 5e80: dfc25ee4 dfc25e90 807a7414 8079d80c 00000064 00000001 00000000 dfc25eac 5ea0: 84fe4010 834e4f68 00006400 0000000b dfc25ea0 00000000 00000000 fad3eba5 5ec0: 84feb6c0 40946400 200000c0 200000c0 84feb6c0 00000003 dfc25ef4 dfc25ee8 5ee0: 807a7534 fad3eba5 dfc25f14 40946400 00000000 84feb6c1 200000c0 84feb6c0 5f00: 00000003 848da400 dfc25fa4 dfc25f18 805786c0 813c68f0 ecac8b10 848da400 5f20: dfc25f3c dfc25f30 81a604f8 81a603c8 dfc25f54 dfc25f40 8025c484 8028d914 5f40: dfc25fb0 40000000 dfc25f84 dfc25f58 802229ec 8025c440 00000000 8281cfb4 5f60: dfc25fb0 0014ca70 ecac8b10 80222940 00000000 fad3eba5 dfc25fac 00000000 5f80: 00000000 00316448 00000036 8020029c 848da400 00000036 00000000 dfc25fa8 5fa0: 80200060 8057859c 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f810bc 5fe0: 76f80ec0 76f80eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce1a4>] (parport_attach) from [<813ca3a8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:8407ddc4 r5:81e17bdc r4:829d1bf4 [<813ca2a0>] (comedi_device_attach) from [<813c5ef4>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:848da400 r7:200000c0 r6:b5403587 r5:8407dd80 r4:200000c0 [<813c5df4>] (do_devconfig_ioctl) from [<813c6ec0>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:848da400 r7:200000c0 r6:200000c0 r5:8407dd80 r4:84feb6c0 [<813c68e4>] (comedi_unlocked_ioctl) from [<805786c0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c68e4>] (comedi_unlocked_ioctl) from [<805786c0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c68e4>] (comedi_unlocked_ioctl) from [<805786c0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c68e4>] (comedi_unlocked_ioctl) from [<805786c0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:848da400 r9:00000003 r8:84feb6c0 r7:200000c0 r6:84feb6c1 r5:00000000 r4:40946400 [<80578590>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc25fa8 to 0xdfc25ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f810bc 5fe0: 76f80ec0 76f80eb0 000195a4 00132510 r10:00000036 r9:848da400 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