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: 15623 Comm: syz.2.3155 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 : [<813ce690>] lr : [<813ce680>] psr: 60000013 sp : dfb21d30 ip : dfb21d30 fp : dfb21d54 r10: 82b25910 r9 : 00000003 r8 : 841a76c0 r7 : dfb21d90 r6 : 841a76c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e177dc r1 : 00000001 r0 : 813ce300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 861f2a40 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 841a76c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841a76c0 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 0xdfb20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb20000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.3155 (pid: 15623, stack limit = 0xdfb20000) Stack: (0xdfb21d30 to 0xdfb22000) 1d20: 823f13b8 841a76c0 829d1bf4 829d1bf4 1d40: 81e17c9c 841a7704 dfb21d8c dfb21d58 813ca720 813ce528 20000280 00000000 1d60: dfb21d7c 20000280 841a76c0 b5403587 20000280 853eb000 40946400 00000003 1d80: dfb21e4c dfb21d90 813c626c 813ca624 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 0000001f 000000cd 00000400 00000005 00000cc7 00000005 1dc0: ffffbf13 00000005 00000009 0000008f 00001600 00000003 00000002 000000fa 1de0: 0000e1cb 00000006 ffffffff 00000003 ffffffff 00000087 fffffffd fffffffd 1e00: fffdfff5 00000009 00200003 2000003c 00000006 00000009 07fffffc dffffffa 1e20: 00000000 10069714 00000000 8609a6c0 841a76c0 20000280 20000280 853eb000 1e40: dfb21f14 dfb21e50 813c7238 813c6178 00000000 00000000 00000000 10069714 1e60: 00000000 00000000 824625b4 0000005f 83cd5210 841a76f0 8428c684 853eb000 1e80: dfb21ee4 dfb21e90 807a7684 8079da7c 00000064 00000001 00000000 dfb21eac 1ea0: 857b8190 834ee880 00006400 0000000b dfb21ea0 00000000 00000000 10069714 1ec0: 8609a6c0 40946400 20000280 20000280 8609a6c0 00000003 dfb21ef4 dfb21ee8 1ee0: 807a77a4 10069714 dfb21f14 40946400 00000000 8609a6c1 20000280 8609a6c0 1f00: 00000003 853eb000 dfb21fa4 dfb21f18 805788b8 813c6c68 ecac8b10 853eb000 1f20: dfb21f3c dfb21f30 81a60ab8 81a60988 dfb21f54 dfb21f40 8025c484 8028d914 1f40: dfb21fb0 40000000 dfb21f84 dfb21f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfb21fb0 0014ced0 ecac8b10 80222940 00000000 10069714 dfb21fac 00000000 1f80: 00000000 00316308 00000036 8020029c 853eb000 00000036 00000000 dfb21fa8 1fa0: 80200060 80578794 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f990bc 1fe0: 76f98ec0 76f98eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce51c>] (parport_attach) from [<813ca720>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841a7704 r5:81e17c9c r4:829d1bf4 [<813ca618>] (comedi_device_attach) from [<813c626c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:853eb000 r7:20000280 r6:b5403587 r5:841a76c0 r4:20000280 [<813c616c>] (do_devconfig_ioctl) from [<813c7238>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:853eb000 r7:20000280 r6:20000280 r5:841a76c0 r4:8609a6c0 [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:853eb000 r9:00000003 r8:8609a6c0 r7:20000280 r6:8609a6c1 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb21fa8 to 0xdfb21ff0) 1fa0: 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f990bc 1fe0: 76f98ec0 76f98eb0 0001928c 00132970 r10:00000036 r9:853eb000 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