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: 4085 Comm: syz.0.97 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 : [<814087e8>] lr : [<814087d8>] psr: 60000013 sp : dfc69d28 ip : dfc69d28 fp : dfc69d4c r10: 82b28ad8 r9 : 00000003 r8 : 845c96c0 r7 : dfc69d88 r6 : 845c96c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1a338 r1 : 00000001 r0 : 81408458 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 861b7500 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 845c96c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 845c96c0 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 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfc68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.97 (pid: 4085, stack limit = 0xdfc68000) Stack: (0xdfc69d28 to 0xdfc6a000) 9d20: 82432d2c 845c96c0 829d3f08 829d3f08 81e1a7f8 845c9704 9d40: dfc69d84 dfc69d50 81404490 81408680 845c96f0 00000000 dfc69d74 200000c0 9d60: 845c96c0 b5403587 845c96f0 83871800 40946400 00000003 dfc69e44 dfc69d88 9d80: 813ffde8 81404394 656d6f63 705f6964 6f707261 00007472 00000000 00004f27 9da0: 0000001f 00010000 00000004 00000003 00000cc7 00000004 00080008 0000000e 9dc0: 00000006 00000002 00000001 00000007 00000001 00000006 10000105 00000000 9de0: 0001a44d 00000003 3fff7fff 00000089 00000010 00000001 20001e58 0080000b 9e00: 00000e69 0000003c 00000008 00000006 ffffffff effffff8 00000000 94a14729 9e20: 00000000 85bf13c0 845c96c0 200000c0 845c96f0 83871800 dfc69f14 dfc69e48 9e40: 81400ddc 813ffcf4 00000000 00000000 00000000 00000000 00000000 94a14729 9e60: 00000000 00000000 824a35ec 0000005f 84083600 00000064 84627054 83871800 9e80: dfc69ee4 dfc69e90 807b7d30 807ae254 00000064 00000001 00000000 dfc69eac 9ea0: 85987910 83438880 00006400 0000000b dfc69ea0 00000000 00000000 94a14729 9ec0: 85bf13c0 40946400 200000c0 200000c0 85bf13c0 00000003 dfc69ef4 dfc69ee8 9ee0: 807b7e50 94a14729 dfc69f14 40946400 00000000 85bf13c1 200000c0 85bf13c0 9f00: 00000003 83871800 dfc69fa4 dfc69f18 805854f4 8140082c ecac8b10 83871800 9f20: dfc69f3c dfc69f30 81aaf29c 81aaf16c dfc69f54 dfc69f40 8025bcbc 8028e07c 9f40: dfc69fb0 40000000 dfc69f84 dfc69f58 80221a38 8025bc78 00000000 8281d17c 9f60: dfc69fb0 0014c880 ecac8b10 8022198c 00000000 94a14729 dfc69fac 00000000 9f80: 00000000 00316310 00000036 8020029c 83871800 00000036 00000000 dfc69fa8 9fa0: 80200060 805853d0 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f340bc 9fe0: 76f33ec0 76f33eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<81408674>] (parport_attach) from [<81404490>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:845c9704 r5:81e1a7f8 r4:829d3f08 [<81404388>] (comedi_device_attach) from [<813ffde8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83871800 r7:845c96f0 r6:b5403587 r5:845c96c0 r4:200000c0 [<813ffce8>] (do_devconfig_ioctl) from [<81400ddc>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83871800 r7:845c96f0 r6:200000c0 r5:845c96c0 r4:85bf13c0 [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400820>] (comedi_unlocked_ioctl) from [<805854f4>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83871800 r9:00000003 r8:85bf13c0 r7:200000c0 r6:85bf13c1 r5:00000000 r4:40946400 [<805853c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc69fa8 to 0xdfc69ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f340bc 9fe0: 76f33ec0 76f33eb0 0001929c 00132320 r10:00000036 r9:83871800 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