program: mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./sys\x00', 0x1ff) mount(0x0, &(0x7f0000000000)='./sys\x00', &(0x7f0000000040)='sysfs\x00', 0x0, 0x0) r0 = openat(0xffffffffffffff9c, &(0x7f0000000080)='./sys/module/block2mtd/parameters/block2mtd\x00', 0x1, 0x0) write(r0, &(0x7f00000000c0)='/dev/loop0,0', 0xc) [ 94.412162][ T5325] Oops: divide error: 0000 [#1] SMP KASAN NOPTI [ 94.414615][ T5325] CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 94.418184][ T5325] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 94.422334][ T5325] RIP: 0010:block2mtd_setup2+0x592/0xda0 [ 94.424865][ T5325] Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 f6 41 89 d5 31 ff 4c 89 ee e8 1f da 39 fb 4d 85 ed 0f 85 90 04 [ 94.432507][ T5325] RSP: 0018:ffffc9000f26f9a0 EFLAGS: 00010246 [ 94.435157][ T5325] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 94.438182][ T5325] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000 [ 94.441879][ T5325] RBP: ffffc9000f26fb98 R08: ffff8880353962ef R09: 1ffff11006a72c5d [ 94.445292][ T5325] R10: dffffc0000000000 R11: ffffed1006a72c5e R12: 0000000000000000 [ 94.448551][ T5325] R13: ffff88801d02d0b4 R14: ffff8880122be000 R15: ffff8880122be000 [ 94.454201][ T5325] FS: 00007fa7d8c5d6c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000 [ 94.459511][ T5325] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 94.462268][ T5325] CR2: 00007fa7d801bb30 CR3: 000000003fb3c000 CR4: 0000000000352ef0 [ 94.465383][ T5325] Call Trace: [ 94.466790][ T5325] [ 94.468037][ T5325] ? rcu_is_watching+0x15/0xb0 [ 94.470060][ T5325] ? __pfx_block2mtd_setup2+0x10/0x10 [ 94.472242][ T5325] ? __mutex_lock+0x30d/0x1550 [ 94.474239][ T5325] ? sysfs_file_kobj+0x1a/0x230 [ 94.476151][ T5325] block2mtd_setup+0x27/0xe0 [ 94.478004][ T5325] param_attr_store+0x214/0x310 [ 94.480046][ T5325] ? __pfx_param_attr_store+0x10/0x10 [ 94.482378][ T5325] ? __pfx_sysfs_kf_write+0x10/0x10 [ 94.484500][ T5325] module_attr_store+0x65/0x90 [ 94.486534][ T5325] kernfs_fop_write_iter+0x3a4/0x540 [ 94.488628][ T5325] vfs_write+0x612/0xba0 [ 94.490322][ T5325] ? __pfx_vfs_write+0x10/0x10 [ 94.492162][ T5325] ? __fget_files+0x2a/0x420 [ 94.493997][ T5325] ksys_write+0x150/0x270 [ 94.495743][ T5325] ? __pfx_ksys_write+0x10/0x10 [ 94.497703][ T5325] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.500175][ T5325] do_syscall_64+0x174/0x580 [ 94.502014][ T5325] ? clear_bhb_loop+0x40/0x90 [ 94.503882][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.506278][ T5325] RIP: 0033:0x7fa7d7d9e019 [ 94.508012][ T5325] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 94.515674][ T5325] RSP: 002b:00007fa7d8c5cfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 94.518990][ T5325] RAX: ffffffffffffffda RBX: 00007fa7d8025fa0 RCX: 00007fa7d7d9e019 [ 94.522219][ T5325] RDX: 000000000000000c RSI: 00002000000000c0 RDI: 0000000000000003 [ 94.525345][ T5325] RBP: 00007fa7d7e3500c R08: 0000000000000000 R09: 0000000000000000 [ 94.528516][ T5325] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 94.531684][ T5325] R13: 00007fa7d8026038 R14: 00007fa7d8025fa0 R15: 00007ffe5587a628 [ 94.534922][ T5325] [ 94.536264][ T5325] Modules linked in: [ 94.538189][ T5325] ---[ end trace 0000000000000000 ]--- [ 94.540925][ T5325] RIP: 0010:block2mtd_setup2+0x592/0xda0 [ 94.543285][ T5325] Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 f6 41 89 d5 31 ff 4c 89 ee e8 1f da 39 fb 4d 85 ed 0f 85 90 04 [ 94.550836][ T5325] RSP: 0018:ffffc9000f26f9a0 EFLAGS: 00010246 [ 94.553331][ T5325] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 94.556737][ T5325] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000 [ 94.560285][ T5325] RBP: ffffc9000f26fb98 R08: ffff8880353962ef R09: 1ffff11006a72c5d [ 94.563550][ T5325] R10: dffffc0000000000 R11: ffffed1006a72c5e R12: 0000000000000000 [ 94.566842][ T5325] R13: ffff88801d02d0b4 R14: ffff8880122be000 R15: ffff8880122be000 [ 94.570124][ T5325] FS: 00007fa7d8c5d6c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000 [ 94.574026][ T5325] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 94.576892][ T5325] CR2: 00007ffee237bf52 CR3: 000000003fb3c000 CR4: 0000000000352ef0 [ 94.580004][ T5325] Kernel panic - not syncing: Fatal exception [ 94.582591][ T5325] Kernel Offset: disabled [ 94.584164][ T5325] Rebooting in 86400 seconds..