8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f23 when write [fee04f23] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 22741 Comm: syz.2.3865 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 : [<8140a610>] lr : [<8140a600>] psr: 60000013 sp : ea5c5d28 ip : ea5c5d28 fp : ea5c5d4c r10: 82b28ad8 r9 : 00000003 r8 : 844226c0 r7 : ea5c5d88 r6 : 844226c0 r5 : 00000000 r4 : 00000000 r3 : fee04f23 r2 : 81e1a398 r1 : 00000001 r0 : 8140a280 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86341580 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 844226c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea5c4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 844226c0 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 0xea5c4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea5c4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.3865 (pid: 22741, stack limit = 0xea5c4000) Stack: (0xea5c5d28 to 0xea5c6000) 5d20: 824334c0 844226c0 829d3f08 829d3f08 81e1a858 84422704 5d40: ea5c5d84 ea5c5d50 814062bc 8140a4a8 844226f0 00000000 ea5c5d74 20000200 5d60: 844226c0 b5403587 844226f0 85906000 40946400 00000003 ea5c5e44 ea5c5d88 5d80: 81401c14 814061c0 656d6f63 705f6964 6f707261 00007472 00000000 00004f23 5da0: 00000005 00000002 04000401 00000001 40000cc7 00000fff 5c952399 00000005 5dc0: 000003ff 00000802 00000008 00010001 00000001 00000009 0000e1cb 00000006 5de0: 00000401 00000003 00000395 80000089 fffffffd 00000032 fffffff5 00000005 5e00: 00000007 0000003c 00000009 00000003 08000000 00002ec0 00000000 333fd8a7 5e20: 00000000 8692b6c0 844226c0 20000200 844226f0 85906000 ea5c5f14 ea5c5e48 5e40: 81402c08 81401b20 00000000 00000000 00000000 00000000 00000000 333fd8a7 5e60: 00000000 00000000 824a45ec 0000005f 840c39f0 00000064 845a63fc 85906000 5e80: ea5c5ee4 ea5c5e90 807b8780 807aeca4 00000064 00000001 00000000 ea5c5eac 5ea0: 85f9d6d0 834d9c38 00006400 0000000b ea5c5ea0 00000000 00000000 333fd8a7 5ec0: 8692b6c0 40946400 20000200 20000200 8692b6c0 00000003 ea5c5ef4 ea5c5ee8 5ee0: 807b88a0 333fd8a7 ea5c5f14 40946400 00000000 8692b6c1 20000200 8692b6c0 5f00: 00000003 85906000 ea5c5fa4 ea5c5f18 80585d10 81402658 ecac8b10 85906000 5f20: ea5c5f3c ea5c5f30 81ab1724 81ab15f4 ea5c5f54 ea5c5f40 8025bcbc 8028e0c4 5f40: ea5c5fb0 40000000 ea5c5f84 ea5c5f58 80221a38 8025bc78 00000000 8281cf7c 5f60: ea5c5fb0 0014c8c0 ecac8b10 8022198c 00000000 333fd8a7 ea5c5fac 00000000 5f80: 00000000 00326310 00000036 8020029c 85906000 00000036 00000000 ea5c5fa8 5fa0: 80200060 80585bec 00000000 00000000 00000003 40946400 20000200 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f050bc 5fe0: 76f04ec0 76f04eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<8140a49c>] (parport_attach) from [<814062bc>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84422704 r5:81e1a858 r4:829d3f08 [<814061b4>] (comedi_device_attach) from [<81401c14>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85906000 r7:844226f0 r6:b5403587 r5:844226c0 r4:20000200 [<81401b14>] (do_devconfig_ioctl) from [<81402c08>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85906000 r7:844226f0 r6:20000200 r5:844226c0 r4:8692b6c0 [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85906000 r9:00000003 r8:8692b6c0 r7:20000200 r6:8692b6c1 r5:00000000 r4:40946400 [<80585be0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea5c5fa8 to 0xea5c5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000200 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f050bc 5fe0: 76f04ec0 76f04eb0 000192bc 00132360 r10:00000036 r9:85906000 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