8<--- cut here --- Unable to handle kernel paging request at virtual address fee00078 when write [fee00078] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 19964 Comm: syz.7.2775 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81458be4>] lr : [<81458bd4>] psr: 60000013 sp : e0095d30 ip : e0095d30 fp : e0095d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8334be40 r7 : e0095d90 r6 : 8334be40 r5 : 00000000 r4 : 00000000 r3 : fee00078 r2 : 81e276c8 r1 : 00000001 r0 : 81458844 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86c13d00 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8334be40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0094000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8334be40 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 0xe0094000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xe0094000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.7.2775 (pid: 19964, stack limit = 0xe0094000) Stack: (0xe0095d30 to 0xe0096000) 5d20: ffffffff 00000004 00000000 82bd2abc 5d40: 81e27b88 00000000 e0095d8c e0095d58 81454748 81458a6c 40946400 00000000 5d60: e0095d7c 20000600 8334be40 b5403587 40946400 00000003 00000006 83e32580 5d80: e0095e4c e0095d90 8144ff54 8145464c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000078 00000000 00000000 0000000c 00000008 00000006 00100002 5dc0: 00000007 00000005 00000100 00000004 00000001 00000001 00020003 00000000 5de0: 00000101 00000083 00000007 00000003 00001b18 00000016 00000004 00000000 5e00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 5e20: 00000000 a4bab971 00000000 838fe300 8334be40 20000600 40946400 00000003 5e40: e0095f14 e0095e50 81451278 8144fe8c 00000000 a4bab971 00000000 00000000 5e60: 82531804 e0095ea4 0000005f 841c1c00 00000064 8334be70 e0095ee4 e0095e88 5e80: 807e9760 807dfa74 00000064 00000001 00000000 e0095ea4 871f1310 834e6550 5ea0: 00006400 0000000b e0095e98 00000000 00000000 a4bab971 00000000 838fe300 5ec0: 40946400 20000600 20000600 838fe300 00000006 83e32580 e0095ef4 e0095ee8 5ee0: 807e9894 a4bab971 e0095f14 00000000 838fe301 40946400 20000600 838fe300 5f00: 00000006 83e32580 e0095fa4 e0095f18 805a1adc 81450f30 ecac8b10 83e32580 5f20: e0095f3c e0095f30 81b16c74 81b16b40 e0095f54 e0095f40 8025a6bc 8028e2a4 5f40: e0095fb0 40000000 e0095f84 e0095f58 80220be0 8025a678 00000000 82a1c63c 5f60: e0095fb0 0013e9b0 ecac8b10 80220b34 00000000 a4bab971 e0095fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83e32580 00000036 00000000 e0095fa8 5fa0: 80200060 805a18a4 00000000 00000000 00000006 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f630dc 5fe0: 76f62e88 76f62e78 00018ebc 00130810 60000010 00000006 00000000 00000000 Call trace: [<81458a60>] (parport_attach) from [<81454748>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27b88 r4:82bd2abc [<81454640>] (comedi_device_attach) from [<8144ff54>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83e32580 r9:00000006 r8:00000003 r7:40946400 r6:b5403587 r5:8334be40 r4:20000600 [<8144fe80>] (do_devconfig_ioctl) from [<81451278>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8334be40 r4:838fe300 [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e32580 r9:00000006 r8:838fe300 r7:20000600 r6:40946400 r5:838fe301 r4:00000000 [<805a1898>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0095fa8 to 0xe0095ff0) 5fa0: 00000000 00000000 00000006 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f630dc 5fe0: 76f62e88 76f62e78 00018ebc 00130810 r10:00000036 r9:83e32580 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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