------------[ cut here ]------------
WARNING: drivers/mtd/mtdcore.c:719 at add_mtd_device+0x7a8/0x7f0 drivers/mtd/mtdcore.c:719, CPU#1: syz.0.135/4445
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 4445 Comm: syz.0.135 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Call trace: 
[<80201998>] (dump_backtrace) from [<80201a8c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:82a20ef8 r6:00000000 r5:8232b538 r4:00000001
[<80201a74>] (show_stack) from [<8021e534>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201a74>] (show_stack) from [<8021e534>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e4d8>] (dump_stack_lvl) from [<8021e560>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:82a20ef8 r6:00000000 r5:84fa6200 r4:82c7fd40
[<8021e548>] (dump_stack) from [<80202590>] (vpanic+0x114/0x320 kernel/panic.c:651)
[<8020247c>] (vpanic) from [<802027d0>] (trace_suspend_resume+0x0/0x100 kernel/panic.c:788)
 r7:80d46b94
[<8020279c>] (panic) from [<80250ad0>] (check_panic_on_warn kernel/panic.c:525 [inline])
[<8020279c>] (panic) from [<80250ad0>] (get_taint+0x0/0x1c kernel/panic.c:520)
 r3:82a0b144 r2:00000001 r1:8231129c r0:82318bf8
[<80250a58>] (check_panic_on_warn) from [<80250c4c>] (__warn+0x98/0x1a4 kernel/panic.c:1104)
[<80250bb4>] (__warn) from [<80250ed0>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:1136)
 r8:00000009 r7:823e8234 r6:dfe1dc4c r5:84fa6200 r4:00000000
[<80250d5c>] (warn_slowpath_fmt) from [<80d46b94>] (add_mtd_device+0x7a8/0x7f0 drivers/mtd/mtdcore.c:719)
 r10:000084bb r9:84382708 r8:86625cf8 r7:84382708 r6:84382400 r5:00000000
 r4:86625c00
[<80d463ec>] (add_mtd_device) from [<80d49364>] (mtd_add_partition+0x140/0x204 drivers/mtd/mtdpart.c:280)
 r10:000084bb r9:84382708 r8:86625f10 r7:84382708 r6:86625c00 r5:84382400
 r4:84382730
[<80d49224>] (mtd_add_partition) from [<80d4c820>] (mtdchar_blkpg_ioctl drivers/mtd/mtdchar.c:562 [inline])
[<80d49224>] (mtd_add_partition) from [<80d4c820>] (mtdchar_ioctl+0x125c/0x1474 drivers/mtd/mtdchar.c:1218)
 r10:84fa6200 r9:865bfd40 r8:8387c780 r7:84382400 r6:20000140 r5:00000008
 r4:000084bb
[<80d4b5c4>] (mtdchar_ioctl) from [<80d4ca84>] (mtdchar_unlocked_ioctl+0x4c/0x64 drivers/mtd/mtdchar.c:1241)
 r10:84fa6200 r9:00000004 r8:8387c780 r7:20000140 r6:00001269 r5:8387c780
 r4:84382740
[<80d4ca38>] (mtdchar_unlocked_ioctl) from [<805b9f1c>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80d4ca38>] (mtdchar_unlocked_ioctl) from [<805b9f1c>] (do_vfs_ioctl fs/ioctl.c:551 [inline])
[<80d4ca38>] (mtdchar_unlocked_ioctl) from [<805b9f1c>] (__do_sys_ioctl fs/ioctl.c:595 [inline])
[<80d4ca38>] (mtdchar_unlocked_ioctl) from [<805b9f1c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583)
 r7:20000140 r6:00001269 r5:8387c781 r4:00000000
[<805b9cd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfe1dfa8 to 0xdfe1dff0)
dfa0:                   00000000 00000000 00000004 00001269 20000140 00000000
dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa90dc
dfe0: 76fa8e88 76fa8e78 00018ebc 00130820
 r10:00000036 r9:84fa6200 r8:8020029c r7:00000036 r6:00346310 r5:00000000
 r4:00000000
Rebooting in 86400 seconds..