8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10666 Comm: syz.0.1818 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:99 [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 : [<814a0728>] lr : [<814a0714>] psr: 60000013 sp : dfcf9cb8 ip : dfcf9cb8 fp : dfcf9cd4 r10: 00000140 r9 : 00000004 r8 : dfcf9da4 r7 : 00000000 r6 : 0000009b r5 : 846a9cc0 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 846a9cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86007c40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 846a9cc0 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 846a9cc0 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 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.0.1818 (pid: 10666, stack limit = 0xdfcf8000) Stack: (0xdfcf9cb8 to 0xdfcfa000) 9ca0: 814a06c8 00000140 9cc0: 846a9cc0 00000000 dfcf9cf4 dfcf9cd8 814a0404 814a06d4 00000140 80546014 9ce0: 86c53800 86c53800 dfcf9d14 dfcf9cf8 814a07bc 814a03b8 846a9cc0 00000000 9d00: 86c53800 00000000 dfcf9d54 dfcf9d18 814a096c 814a0740 ffffffff 00000004 9d20: 82a22dc0 00000000 00000000 82bd965c 846a9cc0 00000000 dfcf9d90 846a9cc0 9d40: 00000000 82d30dfc dfcf9d8c dfcf9d58 8148f310 814a0904 40946400 00000000 9d60: dfcf9d7c 200000c0 846a9cc0 b5403587 40946400 00000002 00000003 84ff3100 9d80: dfcf9e4c dfcf9d90 8148ab14 8148f214 35353238 00000000 00000000 00000000 9da0: 00000000 00000140 00000009 00000007 00000002 10000007 00000007 00008002 9dc0: 00008000 00000007 0000c72d 00000000 00000007 00000003 0000000a 00000029 9de0: 000072ef 00000101 00000006 00000006 00000005 00000004 00000006 00000006 9e00: 00000009 00001000 00000008 00000471 ffffff7f 00000383 00008001 00000004 9e20: 00000000 208a0431 00000000 86e67b80 846a9cc0 200000c0 40946400 00000002 9e40: dfcf9f14 dfcf9e50 8148be3c 8148aa54 00000000 208a0431 00000000 00000000 9e60: 8254980c dfcf9ea4 0000005f 847b5dd8 00000064 846a9cf0 dfcf9ee4 dfcf9e88 9e80: 80806188 807fc404 00000064 00000001 00000000 dfcf9ea4 83fe3f10 834ecee0 9ea0: 00006400 0000000b dfcf9e98 00000000 00000000 208a0431 00000000 86e67b80 9ec0: 40946400 200000c0 200000c0 86e67b80 00000003 84ff3100 dfcf9ef4 dfcf9ee8 9ee0: 808062bc 208a0431 dfcf9f14 00000000 86e67b81 40946400 200000c0 86e67b80 9f00: 00000003 84ff3100 dfcf9fa4 dfcf9f18 805bab28 8148baf4 ecac8b10 84ff3100 9f20: dfcf9f3c dfcf9f30 81b58220 81b580ec dfcf9f54 dfcf9f40 8025a7a8 8028e490 9f40: dfcf9fb0 40000000 dfcf9f84 dfcf9f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: dfcf9fb0 0013e9c0 ecac8b10 80220b30 00000000 208a0431 dfcf9fac 00000000 9f80: 00000000 00356310 00000036 8020029c 84ff3100 00000036 00000000 dfcf9fa8 9fa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5a0dc 9fe0: 76f59e88 76f59e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<814a06c8>] (subdev_8255_io) from [<814a0404>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:846a9cc0 r5:00000140 r4:814a06c8 [<814a03ac>] (subdev_8255_do_config) from [<814a07bc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a03ac>] (subdev_8255_do_config) from [<814a07bc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86c53800 [<814a0734>] (subdev_8255_io_init) from [<814a096c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a0734>] (subdev_8255_io_init) from [<814a096c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86c53800 r5:00000000 r4:846a9cc0 [<814a08f8>] (dev_8255_attach) from [<8148f310>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:846a9cc0 r7:dfcf9d90 r6:00000000 r5:846a9cc0 r4:82bd965c [<8148f208>] (comedi_device_attach) from [<8148ab14>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84ff3100 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:846a9cc0 r4:200000c0 [<8148aa48>] (do_devconfig_ioctl) from [<8148be3c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200000c0 r5:846a9cc0 r4:86e67b80 [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84ff3100 r9:00000003 r8:86e67b80 r7:200000c0 r6:40946400 r5:86e67b81 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcf9fa8 to 0xdfcf9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f5a0dc 9fe0: 76f59e88 76f59e78 00018ebc 00130820 r10:00000036 r9:84ff3100 r8:8020029c r7:00000036 r6:00356310 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