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: 1 UID: 0 PID: 12146 Comm: syz.1.1917 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 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 : [<81465fb8>] lr : [<81465fa4>] psr: 60000013 sp : dfbe5cb8 ip : dfbe5cb8 fp : dfbe5cd4 r10: 00000100 r9 : 00000004 r8 : dfbe5da4 r7 : 00000000 r6 : 0000009b r5 : 8334b240 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8334b240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fc9f00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8334b240 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 8334b240 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 0xdfbe4000 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 0xdfbe4000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfbe4000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.1.1917 (pid: 12146, stack limit = 0xdfbe4000) Stack: (0xdfbe5cb8 to 0xdfbe6000) 5ca0: 81465f58 00000100 5cc0: 8334b240 00000000 dfbe5cf4 dfbe5cd8 81465c94 81465f64 00000100 805324c0 5ce0: 8646b800 8646b800 dfbe5d14 dfbe5cf8 8146604c 81465c48 8334b240 00000000 5d00: 8646b800 00000000 dfbe5d54 dfbe5d18 814661fc 81465fd0 ffffffff 00000004 5d20: 82a20900 00000000 00000000 82bd3278 8334b240 00000000 dfbe5d90 8334b240 5d40: 00000000 82d2cdc4 dfbe5d8c dfbe5d58 81454b88 81466194 40946400 00000000 5d60: dfbe5d7c 20000440 8334b240 b5403587 40946400 00000003 00000003 83fa0000 5d80: dfbe5e4c dfbe5d90 81450394 81454a8c 35353238 00000000 00000000 00000000 5da0: 00000000 00000100 00000008 00000003 00000001 000000e7 80000008 00000000 5dc0: 00000a82 0000ff46 00000007 00000cf3 00000009 000001d8 00000002 00000006 5de0: 00000101 00000034 0001008b 00000003 00000002 00000004 80000001 00000008 5e00: 02000007 0000000b 10000003 0000003c 00000005 000001ff 00010003 fffffff6 5e20: 00000000 d8fe93f5 00000000 838a8800 8334b240 20000440 40946400 00000003 5e40: dfbe5f14 dfbe5e50 814516b8 814502cc 00000000 d8fe93f5 00000000 00000000 5e60: 82531804 dfbe5ea4 0000005f 84572058 00000064 8334b270 dfbe5ee4 dfbe5e88 5e80: 807e97a0 807dfab4 00000064 00000001 00000000 dfbe5ea4 83843550 834ee198 5ea0: 00006400 0000000b dfbe5e98 00000000 00000000 d8fe93f5 00000000 838a8800 5ec0: 40946400 20000440 20000440 838a8800 00000003 83fa0000 dfbe5ef4 dfbe5ee8 5ee0: 807e98d4 d8fe93f5 dfbe5f14 00000000 838a8801 40946400 20000440 838a8800 5f00: 00000003 83fa0000 dfbe5fa4 dfbe5f18 805a1b0c 81451370 ecac8b10 83fa0000 5f20: dfbe5f3c dfbe5f30 81b170d4 81b16fa0 dfbe5f54 dfbe5f40 8025a6bc 8028e2a4 5f40: dfbe5fb0 40000000 dfbe5f84 dfbe5f58 80220be0 8025a678 00000000 82a1c63c 5f60: dfbe5fb0 0013e9b0 ecac8b10 80220b34 00000000 d8fe93f5 dfbe5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83fa0000 00000036 00000000 dfbe5fa8 5fa0: 80200060 805a18d4 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f040dc 5fe0: 76f03e88 76f03e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81465f58>] (subdev_8255_io) from [<81465c94>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8334b240 r5:00000100 r4:81465f58 [<81465c3c>] (subdev_8255_do_config) from [<8146604c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81465c3c>] (subdev_8255_do_config) from [<8146604c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8646b800 [<81465fc4>] (subdev_8255_io_init) from [<814661fc>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81465fc4>] (subdev_8255_io_init) from [<814661fc>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8646b800 r5:00000000 r4:8334b240 [<81466188>] (dev_8255_attach) from [<81454b88>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8334b240 r7:dfbe5d90 r6:00000000 r5:8334b240 r4:82bd3278 [<81454a80>] (comedi_device_attach) from [<81450394>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83fa0000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334b240 r4:20000440 [<814502c0>] (do_devconfig_ioctl) from [<814516b8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000440 r5:8334b240 r4:838a8800 [<81451364>] (comedi_unlocked_ioctl) from [<805a1b0c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81451364>] (comedi_unlocked_ioctl) from [<805a1b0c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81451364>] (comedi_unlocked_ioctl) from [<805a1b0c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81451364>] (comedi_unlocked_ioctl) from [<805a1b0c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83fa0000 r9:00000003 r8:838a8800 r7:20000440 r6:40946400 r5:838a8801 r4:00000000 [<805a18c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbe5fa8 to 0xdfbe5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000440 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f040dc 5fe0: 76f03e88 76f03e78 00018ebc 00130810 r10:00000036 r9:83fa0000 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