8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4513 Comm: syz.0.208 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<81465538>] lr : [<81465524>] psr: 60000013 sp : e43e9cb8 ip : e43e9cb8 fp : e43e9cd4 r10: 00000100 r9 : 00000004 r8 : e43e9da4 r7 : 00000000 r6 : 0000009b r5 : 8334c540 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8334c540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863d4a40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8334c540 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8334c540 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xe43e8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe43e8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xe43e8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.0.208 (pid: 4513, stack limit = 0xe43e8000) Stack: (0xe43e9cb8 to 0xe43ea000) 9ca0: 814654d8 00000100 9cc0: 8334c540 00000000 e43e9cf4 e43e9cd8 81465214 814654e4 00000100 80532270 9ce0: 85c29d80 85c29d80 e43e9d14 e43e9cf8 814655cc 814651c8 8334c540 00000000 9d00: 85c29d80 00000000 e43e9d54 e43e9d18 8146577c 81465550 ffffffff 00000004 9d20: 82a20900 00000000 00000000 82bd325c 8334c540 00000000 e43e9d90 8334c540 9d40: 00000000 82d2cdc4 e43e9d8c e43e9d58 81454104 81465714 40946400 00000000 9d60: e43e9d7c 20000180 8334c540 b5403587 40946400 00000002 00000003 83a49900 9d80: e43e9e4c e43e9d90 8144f910 81454008 35353238 00000000 00000000 00000000 9da0: 00000000 00000100 00000000 ffffdfc5 fffffffe ffffffff 000010e5 00007fff 9dc0: 30000002 00000004 00000178 00000000 00000007 00000001 00000000 00000029 9de0: 00000200 00000001 00000008 00000fe9 00000401 00000004 00000004 00000009 9e00: ffffffff 00000ffe 00000000 00000008 00000007 ffffffff fffffff7 00000004 9e20: 00000000 6b8b70b3 00000000 83aaeb00 8334c540 20000180 40946400 00000002 9e40: e43e9f14 e43e9e50 81450c34 8144f848 00000000 6b8b70b3 00000000 00000000 9e60: 82530804 e43e9ea4 0000005f 846e0990 00000064 8334c570 e43e9ee4 e43e9e88 9e80: 807e9510 807df824 00000064 00000001 00000000 e43e9ea4 8383e790 834e8990 9ea0: 00006400 0000000b e43e9e98 00000000 00000000 6b8b70b3 00000000 83aaeb00 9ec0: 40946400 20000180 20000180 83aaeb00 00000003 83a49900 e43e9ef4 e43e9ee8 9ee0: 807e9644 6b8b70b3 e43e9f14 00000000 83aaeb01 40946400 20000180 83aaeb00 9f00: 00000003 83a49900 e43e9fa4 e43e9f18 805a188c 814508ec ecac8b10 83a49900 9f20: e43e9f3c e43e9f30 81b15d14 81b15be0 e43e9f54 e43e9f40 8025a694 8028e1b4 9f40: e43e9fb0 40000000 e43e9f84 e43e9f58 80220be0 8025a650 00000000 82a1c63c 9f60: e43e9fb0 0013e940 ecac8b10 80220b34 00000000 6b8b70b3 e43e9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 83a49900 00000036 00000000 e43e9fa8 9fa0: 80200060 805a1654 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fdb0dc 9fe0: 76fdae88 76fdae78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<814654d8>] (subdev_8255_io) from [<81465214>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8334c540 r5:00000100 r4:814654d8 [<814651bc>] (subdev_8255_do_config) from [<814655cc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814651bc>] (subdev_8255_do_config) from [<814655cc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85c29d80 [<81465544>] (subdev_8255_io_init) from [<8146577c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81465544>] (subdev_8255_io_init) from [<8146577c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85c29d80 r5:00000000 r4:8334c540 [<81465708>] (dev_8255_attach) from [<81454104>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8334c540 r7:e43e9d90 r6:00000000 r5:8334c540 r4:82bd325c [<81453ffc>] (comedi_device_attach) from [<8144f910>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83a49900 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8334c540 r4:20000180 [<8144f83c>] (do_devconfig_ioctl) from [<81450c34>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:20000180 r5:8334c540 r4:83aaeb00 [<814508e0>] (comedi_unlocked_ioctl) from [<805a188c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814508e0>] (comedi_unlocked_ioctl) from [<805a188c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814508e0>] (comedi_unlocked_ioctl) from [<805a188c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814508e0>] (comedi_unlocked_ioctl) from [<805a188c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83a49900 r9:00000003 r8:83aaeb00 r7:20000180 r6:40946400 r5:83aaeb01 r4:00000000 [<805a1648>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe43e9fa8 to 0xe43e9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fdb0dc 9fe0: 76fdae88 76fdae78 00018e58 001307a0 r10:00000036 r9:83a49900 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction