8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 11543 Comm: syz.5.1500 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 : [<81440e68>] lr : [<81440e54>] psr: 60000013 sp : dfa11cb8 ip : dfa11cb8 fp : dfa11cd4 r10: 00000000 r9 : 00000084 r8 : dfa11da4 r7 : 00004f27 r6 : 0000009b r5 : 8301b000 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8301b000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86317240 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8301b000 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301b000 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.5.1500 (pid: 11543, stack limit = 0xdfa10000) Stack: (0xdfa11cb8 to 0xdfa12000) 1ca0: 81440e08 00004f27 1cc0: 8301b000 00004f27 dfa11cf4 dfa11cd8 81440b44 81440e14 00004f27 8052364c 1ce0: 85574000 85574000 dfa11d14 dfa11cf8 81440efc 81440af8 8301b000 00000000 1d00: 85574000 00004f27 dfa11d54 dfa11d18 814410ac 81440e80 82affdbc 830f7580 1d20: 828217c0 00000000 00000000 829d6ec4 8301b000 00000000 dfa11d90 8301b000 1d40: 00000000 82b2f06c dfa11d8c dfa11d58 8142f9f4 81441044 40946400 00000000 1d60: dfa11d7c 20000200 8301b000 b5403587 40946400 00000003 00000003 846aa400 1d80: dfa11e4c dfa11d90 8142b200 8142f8f4 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 0000000a ffffffff 00000401 00000001 00000cd7 00000fff 1dc0: 5c952399 ffffffff 000003ff fffff000 00001600 fffffffe 00000001 00000009 1de0: 0000e1cb 00007bbd 00000004 00000003 00000396 80000089 fffffffe 00000000 1e00: fffffff1 ffffeadb 00000003 0000003a 00000001 00000004 08000000 dffffffa 1e20: 00000000 f9118615 00000000 8677f600 8301b000 20000200 40946400 00000003 1e40: dfa11f14 dfa11e50 8142c524 8142b138 00000000 f9118615 00000000 00000000 1e60: 824b957c dfa11ea4 0000005f 840f9018 00000064 8301b030 dfa11ee4 dfa11e88 1e80: 807cf2b8 807c5690 00000064 00000001 00000000 dfa11ea4 85d370d0 834e3dd0 1ea0: 00006400 0000000b dfa11e98 00000000 00000000 f9118615 00000000 8677f600 1ec0: 40946400 20000200 20000200 8677f600 00000003 846aa400 dfa11ef4 dfa11ee8 1ee0: 807cf3e8 f9118615 dfa11f14 00000000 8677f601 40946400 20000200 8677f600 1f00: 00000003 846aa400 dfa11fa4 dfa11f18 80590874 8142c1dc ecac8b10 846aa400 1f20: dfa11f3c dfa11f30 81ae5094 81ae4f60 dfa11f54 dfa11f40 8025a864 8028c2c8 1f40: dfa11fb0 40000000 dfa11f84 dfa11f58 80220bf8 8025a820 00000000 8281d2bc 1f60: dfa11fb0 0013e480 ecac8b10 80220b4c 00000000 f9118615 dfa11fac 00000000 1f80: 00000000 00346310 00000036 8020029c 846aa400 00000036 00000000 dfa11fa8 1fa0: 80200060 8059063c 00000000 00000000 00000003 40946400 20000200 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fca0dc 1fe0: 76fc9e88 76fc9e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81440e08>] (subdev_8255_io) from [<81440b44>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8301b000 r5:00004f27 r4:81440e08 [<81440aec>] (subdev_8255_do_config) from [<81440efc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81440aec>] (subdev_8255_do_config) from [<81440efc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85574000 [<81440e74>] (subdev_8255_io_init) from [<814410ac>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81440e74>] (subdev_8255_io_init) from [<814410ac>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85574000 r5:00000000 r4:8301b000 [<81441038>] (dev_8255_attach) from [<8142f9f4>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2f06c r9:00000000 r8:8301b000 r7:dfa11d90 r6:00000000 r5:8301b000 r4:829d6ec4 [<8142f8e8>] (comedi_device_attach) from [<8142b200>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:846aa400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301b000 r4:20000200 [<8142b12c>] (do_devconfig_ioctl) from [<8142c524>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000200 r5:8301b000 r4:8677f600 [<8142c1d0>] (comedi_unlocked_ioctl) from [<80590874>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c1d0>] (comedi_unlocked_ioctl) from [<80590874>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c1d0>] (comedi_unlocked_ioctl) from [<80590874>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c1d0>] (comedi_unlocked_ioctl) from [<80590874>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:846aa400 r9:00000003 r8:8677f600 r7:20000200 r6:40946400 r5:8677f601 r4:00000000 [<80590630>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa11fa8 to 0xdfa11ff0) 1fa0: 00000000 00000000 00000003 40946400 20000200 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fca0dc 1fe0: 76fc9e88 76fc9e78 00018ba0 001302e0 r10:00000036 r9:846aa400 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