8<--- cut here --- Unable to handle kernel paging request at virtual address fee00007 when write [fee00007] *pgd=80000080007003 , *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5547 Comm: syz.1.329 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 : [<81434014>] lr : [<81434004>] psr: 60000013 sp : dfc41d30 ip : dfc41d30 fp : dfc41d54 r10: 82b2f06c r9 : 00000003 r8 : 8337e900 r7 : dfc41d90 r6 : 8337e900 r5 : 00000000 r4 : 00000000 r3 : fee00007 r2 : 81e24af8 r1 : 00000001 r0 : 81433c84 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84de5c80 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 8337e900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc40000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 8337e900 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 0xdfc40000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfc40000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.1.329 (pid: 5547, stack limit = 0xdfc40000) Stack: (0xdfc41d30 to 0xdfc42000) 1d20: 82444c00 8337e900 829d6740 829d6740 1d40: 81e24fb8 00000000 dfc41d8c dfc41d58 8142fb8c 81433eac 40946400 00000000 1d60: dfc41d7c 200000c0 8337e900 b5403587 40946400 00000003 00000003 8506bd40 1d80: dfc41e4c dfc41d90 8142b398 8142fa8c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000007 00000005 00000002 04000401 00000001 40000cc7 00000fff 1dc0: 5c952399 00000005 000003ff 00000802 00000008 00010001 00000001 00000009 1de0: 0000e1cb 00000006 00000401 00000003 00000395 80000081 fffffffd 00000032 1e00: fffffff5 ffffead8 00002007 0000003c 00000009 00000003 08000000 00002ec0 1e20: 00000000 44aa438a 00000000 860d70c0 8337e900 200000c0 40946400 00000003 1e40: dfc41f14 dfc41e50 8142c6bc 8142b2d0 8280c82c 8506bd40 00000000 00000004 1e60: 81c01eb0 00000000 00000002 8462b9f0 00000064 8337e930 dfc41eac 44aa438a 1e80: 8028d92c 00000000 8506bd40 ffffffff dfc41efc 80200c04 8506bd40 8506bd40 1ea0: dfc41ec4 dfc41eb0 81ae9704 8028c380 8142c368 a0000013 dfc41fa4 dfc41ec8 1ec0: 80200c24 81ae96c4 860d70c0 40946400 200000c0 8142c368 00000000 860d70c1 1ee0: 40946400 44aa438a 860d70c0 00000000 860d70c1 40946400 200000c0 860d70c0 1f00: 00000003 8506bd40 dfc41fa4 dfc41f18 805908e4 8142c374 ecac8b10 8506bd40 1f20: dfc41f3c dfc41f30 81ae5234 81ae5100 dfc41f54 dfc41f40 8025a87c 8028c380 1f40: dfc41fb0 40000000 dfc41f84 dfc41f58 80220bf8 8025a838 00000000 8281d2fc 1f60: dfc41fb0 0013e480 ecac8b10 80220b4c 00000000 44aa438a dfc41fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8506bd40 00000036 00000000 dfc41fa8 1fa0: 80200060 805906ac 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fcd0dc 1fe0: 76fcce88 76fcce78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81433ea0>] (parport_attach) from [<8142fb8c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24fb8 r4:829d6740 [<8142fa80>] (comedi_device_attach) from [<8142b398>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8506bd40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8337e900 r4:200000c0 [<8142b2c4>] (do_devconfig_ioctl) from [<8142c6bc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8337e900 r4:860d70c0 [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8506bd40 r9:00000003 r8:860d70c0 r7:200000c0 r6:40946400 r5:860d70c1 r4:00000000 [<805906a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc41fa8 to 0xdfc41ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fcd0dc 1fe0: 76fcce88 76fcce78 00018ba0 001302e0 r10:00000036 r9:8506bd40 r8:8020029c r7:00000036 r6:00346310 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