minix_free_inode: bit 1 already cleared minix_free_inode: bit 1 already cleared VFS: Can't find a Minix filesystem V1 | V2 | V3 on device loop0. minix_free_inode: bit 1 already cleared MINIX-fs: mounting unchecked file system, running fsck is recommended BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 92b96067 P4D 92b96067 PUD 95947067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 0 PID: 28687 Comm: syz-executor.4 Not tainted 4.19.129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline] RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:223 [inline] RIP: 0010:trylock_buffer include/linux/buffer_head.h:367 [inline] RIP: 0010:lock_buffer include/linux/buffer_head.h:373 [inline] RIP: 0010:alloc_branch fs/minix/itree_common.c:88 [inline] RIP: 0010:get_block+0x78b/0x1340 fs/minix/itree_common.c:191 Code: 00 00 49 8b bc 24 28 01 00 00 b9 08 00 00 00 e8 2b 75 bb ff 31 d2 be 74 01 00 00 48 c7 c7 60 44 9c 87 49 89 c4 e8 c5 3b 4b ff 49 0f ba 2c 24 02 0f 92 c0 31 ff 89 c6 88 44 24 78 e8 7e 3c 6d MINIX-fs: mounting unchecked file system, running fsck is recommended RSP: 0018:ffff8880527cf780 EFLAGS: 00010246 RAX: 0000000000000007 RBX: 0000000000000c98 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880456ae2a4 RBP: ffff8880527cf918 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000036fac266 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880527cf844 R15: ffff8880527cf880 FS: 00007fa609155700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000008c006000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: minix_get_block+0xe5/0x110 fs/minix/inode.c:379 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 __block_write_begin fs/buffer.c:2028 [inline] block_write_begin+0x58/0x2e0 fs/buffer.c:2087 minix_write_begin+0x35/0x220 fs/minix/inode.c:415 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3162 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3287 generic_file_write_iter+0x3f8/0x729 mm/filemap.c:3315 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca59 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa609154c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050d660 RCX: 000000000045ca59 RDX: 000000000000fdef RSI: 0000000020000480 RDI: 0000000000000004 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d0f R14: 00000000004cf65e R15: 00007fa6091556d4 Modules linked in: CR2: 0000000000000000 ---[ end trace 2b98e7eaed3d10dd ]--- RIP: 0010:test_and_set_bit arch/x86/include/asm/bitops.h:209 [inline] RIP: 0010:test_and_set_bit_lock arch/x86/include/asm/bitops.h:223 [inline] RIP: 0010:trylock_buffer include/linux/buffer_head.h:367 [inline] RIP: 0010:lock_buffer include/linux/buffer_head.h:373 [inline] RIP: 0010:alloc_branch fs/minix/itree_common.c:88 [inline] RIP: 0010:get_block+0x78b/0x1340 fs/minix/itree_common.c:191 Code: 00 00 49 8b bc 24 28 01 00 00 b9 08 00 00 00 e8 2b 75 bb ff 31 d2 be 74 01 00 00 48 c7 c7 60 44 9c 87 49 89 c4 e8 c5 3b 4b ff 49 0f ba 2c 24 02 0f 92 c0 31 ff 89 c6 88 44 24 78 e8 7e 3c 6d RSP: 0018:ffff8880527cf780 EFLAGS: 00010246 minix_free_inode: bit 1 already cleared MINIX-fs: mounting unchecked file system, running fsck is recommended RAX: 0000000000000007 RBX: 0000000000000c98 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff8880456ae2a4 RBP: ffff8880527cf918 R08: 0000000000000001 R09: 0000000000000000 VFS: Can't find a Minix filesystem V1 | V2 | V3 on device loop5. MINIX-fs: mounting unchecked file system, running fsck is recommended R10: 0000000000000005 R11: 0000000036fac266 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8880527cf844 R15: ffff8880527cf880 FS: 00007fa609155700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdcfa13988 CR3: 000000008c006000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 VFS: Can't find a Minix filesystem V1 | V2 | V3 on device loop0.