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: 14721 Comm: syz.4.2802 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81408d38>] lr : [<81408d28>] psr: 60000013 sp : e0221d28 ip : e0221d28 fp : e0221d4c r10: 82b28ad8 r9 : 00000003 r8 : 8457dc00 r7 : e0221d88 r6 : 8457dc00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 862bbfc0 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 8457dc00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0220000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8457dc00 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 0xe0220000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe0220000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.4.2802 (pid: 14721, stack limit = 0xe0220000) Stack: (0xe0221d28 to 0xe0222000) 1d20: 82432e8c 8457dc00 829d3f08 829d3f08 81e1a778 8457dc44 1d40: e0221d84 e0221d50 814049e0 81408bd0 8457dc30 00000000 e0221d74 200000c0 1d60: 8457dc00 b5403587 8457dc30 863fa400 40946400 00000003 e0221e44 e0221d88 1d80: 81400338 814048e4 656d6f63 705f6964 6f707261 00007472 00000000 00004f27 1da0: 00005d93 00000008 00000006 00000005 00000005 00000009 00000007 54c6cff3 1dc0: 000000fd 00000002 00008401 00000006 00000005 00000006 00000101 00000000 1de0: 00000892 0000a418 40000001 00000005 0000caa3 00000008 20001e5b 00000000 1e00: 00000e66 00000004 00000008 00000005 00000000 fffffff8 00000000 4eccaeb6 1e20: 00000000 84d6a780 8457dc00 200000c0 8457dc30 863fa400 e0221f14 e0221e48 1e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 4eccaeb6 1e60: 00000000 00000000 824a35ec 0000005f 84670250 00000064 844e048c 863fa400 1e80: e0221ee4 e0221e90 807b7f80 807ae4a4 00000064 00000001 00000000 e0221eac 1ea0: 85cd2190 834ed3b8 00006400 0000000b e0221ea0 00000000 00000000 4eccaeb6 1ec0: 84d6a780 40946400 200000c0 200000c0 84d6a780 00000003 e0221ef4 e0221ee8 1ee0: 807b80a0 4eccaeb6 e0221f14 40946400 00000000 84d6a781 200000c0 84d6a780 1f00: 00000003 863fa400 e0221fa4 e0221f18 80585608 81400d7c ecac8b10 863fa400 1f20: e0221f3c e0221f30 81aaf9ac 81aaf87c e0221f54 e0221f40 8025bcbc 8028e0c4 1f40: e0221fb0 40000000 e0221f84 e0221f58 80221a38 8025bc78 00000000 8281d17c 1f60: e0221fb0 0014c8c0 ecac8b10 8022198c 00000000 4eccaeb6 e0221fac 00000000 1f80: 00000000 00326310 00000036 8020029c 863fa400 00000036 00000000 e0221fa8 1fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f9e0bc 1fe0: 76f9dec0 76f9deb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8457dc44 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:863fa400 r7:8457dc30 r6:b5403587 r5:8457dc00 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:863fa400 r7:8457dc30 r6:200000c0 r5:8457dc00 r4:84d6a780 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:863fa400 r9:00000003 r8:84d6a780 r7:200000c0 r6:84d6a781 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0221fa8 to 0xe0221ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f9e0bc 1fe0: 76f9dec0 76f9deb0 000192bc 00132360 r10:00000036 r9:863fa400 r8:8020029c r7:00000036 r6:00326310 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