8<--- cut here --- Unable to handle kernel paging request at virtual address fee04e2a when write [fee04e2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 11342 Comm: syz.5.1901 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 : [<8143e5f0>] lr : [<8143e5dc>] psr: 60000013 sp : dfcb1cb8 ip : dfcb1cb8 fp : dfcb1cd4 r10: 00000000 r9 : 00000084 r8 : dfcb1da4 r7 : 00004e27 r6 : 0000009b r5 : 833d9900 r4 : 00004e2a r3 : 0000009b r2 : fee04e2a r1 : 00000001 r0 : 833d9900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8c68bcc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 833d9900 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 833d9900 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 0xdfcb0000 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 0xdfcb0000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfcb0000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.5.1901 (pid: 11342, stack limit = 0xdfcb0000) Stack: (0xdfcb1cb8 to 0xdfcb2000) 1ca0: 8143e590 00004e27 1cc0: 833d9900 00004e27 dfcb1cf4 dfcb1cd8 8143e2cc 8143e59c 00004e27 805228bc 1ce0: 86214000 86214000 dfcb1d14 dfcb1cf8 8143e684 8143e280 833d9900 00000000 1d00: 86214000 00004e27 dfcb1d54 dfcb1d18 8143e834 8143e608 82b180d4 84001100 1d20: 828217c0 00000000 00000000 829d6e04 833d9900 00000000 dfcb1d90 833d9900 1d40: 00000000 82b2efdc dfcb1d8c dfcb1d58 8142d16c 8143e7cc 40946400 00000000 1d60: dfcb1d7c 20000180 833d9900 b5403587 40946400 00000001 00000003 83f56c00 1d80: dfcb1e4c dfcb1d90 81428980 8142d06c 35353238 00000000 00000000 00000000 1da0: 00000000 00004e27 00000008 0000000a fffffffb 00000006 00800018 00000008 1dc0: 00000003 0000ff46 00000004 01ffffff 0000000b 000001db ffffffff 00000006 1de0: 00000111 00000005 00000092 00000003 ffffff7f 00000006 00180002 00000f23 1e00: 0000868a 02000009 00000000 0000003c 00000014 0000000f 00000004 000000e7 1e20: 00000000 f3128c41 00000000 838d0d80 833d9900 20000180 40946400 00000001 1e40: dfcb1f14 dfcb1e50 81429ca4 814288b8 00000000 f3128c41 00000000 00000000 1e60: 824b857c dfcb1ea4 0000005f 83fa5600 00000064 833d9930 dfcb1ee4 dfcb1e88 1e80: 807cdb3c 807c3f14 00000064 00000001 00000000 dfcb1ea4 864426d0 834ec198 1ea0: 00006400 0000000b dfcb1e98 00000000 00000000 f3128c41 00000000 838d0d80 1ec0: 40946400 20000180 20000180 838d0d80 00000003 83f56c00 dfcb1ef4 dfcb1ee8 1ee0: 807cdc6c f3128c41 dfcb1f14 00000000 838d0d81 40946400 20000180 838d0d80 1f00: 00000003 83f56c00 dfcb1fa4 dfcb1f18 8058fa5c 8142995c ecac8b10 83f56c00 1f20: dfcb1f3c dfcb1f30 81ae18b4 81ae1780 dfcb1f54 dfcb1f40 8025a85c 8028c340 1f40: dfcb1fb0 40000000 dfcb1f84 dfcb1f58 80220bf8 8025a818 00000000 8281d2bc 1f60: dfcb1fb0 0013e290 ecac8b10 80220b4c 00000000 f3128c41 dfcb1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83f56c00 00000036 00000000 dfcb1fa8 1fa0: 80200060 8058f824 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f930dc 1fe0: 76f92e88 76f92e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e590>] (subdev_8255_io) from [<8143e2cc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004e27 r6:833d9900 r5:00004e27 r4:8143e590 [<8143e274>] (subdev_8255_do_config) from [<8143e684>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e274>] (subdev_8255_do_config) from [<8143e684>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86214000 [<8143e5fc>] (subdev_8255_io_init) from [<8143e834>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e5fc>] (subdev_8255_io_init) from [<8143e834>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004e27 r6:86214000 r5:00000000 r4:833d9900 [<8143e7c0>] (dev_8255_attach) from [<8142d16c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:833d9900 r7:dfcb1d90 r6:00000000 r5:833d9900 r4:829d6e04 [<8142d060>] (comedi_device_attach) from [<81428980>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83f56c00 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:833d9900 r4:20000180 [<814288ac>] (do_devconfig_ioctl) from [<81429ca4>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000001 r7:40946400 r6:20000180 r5:833d9900 r4:838d0d80 [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429950>] (comedi_unlocked_ioctl) from [<8058fa5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f56c00 r9:00000003 r8:838d0d80 r7:20000180 r6:40946400 r5:838d0d81 r4:00000000 [<8058f818>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcb1fa8 to 0xdfcb1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f930dc 1fe0: 76f92e88 76f92e78 00018ba0 001300f0 r10:00000036 r9:83f56c00 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